Question

Срочно нужна помощь по алебере!!! 7 класс,даю целых 64 балла!!!уравнения!!!! 1) 6х-12=4х-8 2)0.3х+8=2 3)2х-5-(3х-7)=4 4)7-2(х+3)=9-6х 5)4(х-0.5)-2(х+0.3)=-2.6

Answer 1

6x-4x=-8+12
2x=4
x=2

0.3x=2-8
0.3x=-6
x=-20

2x-3x=4+5-7
-x=2
x=-2

-2x+6x=9-7+6
4x=8
x=2

4x-2x=-2.6+2+0.6
2x=0
x=0

Answer 2

1)6x-4x=12-8
2x=4
x=2
2)0.3x=-6
x=-20
3)2x-3x=4+5-7
-x=2
x=2
4)-2x+6x=9-7+6
-2x=8
x=-4
5)4x-2x=-2,6+2+0,6
2x=0
x=0

Answer 3

Solving Equations

Let's solve the equations you provided step by step:

1) 6x - 12 = 4x - 8

To solve this equation, we need to isolate the variable x on one side of the equation. We can do this by combining like terms and performing inverse operations.

First, let's combine like terms:

6x - 4x = -8 + 12

2x = 4

Next, let's isolate x by dividing both sides of the equation by 2:

2x/2 = 4/2

x = 2

So the solution to the equation is x = 2.

2) 0.3x + 8 = 2

To solve this equation, we'll follow a similar process. Let's isolate the variable x:

0.3x = 2 - 8

0.3x = -6

Next, divide both sides of the equation by 0.3:

(0.3x)/0.3 = -6/0.3

x = -20

So the solution to the equation is x = -20.

3) 2x - 5 - (3x - 7) = 4

To solve this equation, we'll simplify the expression inside the parentheses first:

2x - 5 - 3x + 7 = 4

Combine like terms:

2x - 3x - 5 + 7 = 4

-x + 2 = 4

Next, isolate x by subtracting 2 from both sides of the equation:

(-x + 2) - 2 = 4 - 2

-x = 2

Finally, multiply both sides of the equation by -1 to solve for x:

(-1)(-x) = (-1)(2)

x = -2

So the solution to the equation is x = -2.

4) 7 - 2(x + 3) = 9 - 6x

Let's simplify the equation step by step:

7 - 2x - 6 = 9 - 6x

Combine like terms:

7 - 6 - 2x = 9 - 6x

1 - 2x = 9 - 6x

Next, isolate x by adding 2x to both sides of the equation:

(1 - 2x) + 2x = (9 - 6x) + 2x

1 = 9 - 4x

Now, subtract 9 from both sides of the equation:

1 - 9 = 9 - 9 - 4x

-8 = -4x

Finally, divide both sides of the equation by -4 to solve for x:

(-8)/(-4) = (-4x)/(-4)

2 = x

So the solution to the equation is x = 2.

5) 4(x - 0.5) - 2(x + 0.3) = -2.6

Let's simplify the equation step by step:

4x - 2 - 2x - 0.6 = -2.6

Combine like terms:

4x - 2x - 2 - 0.6 = -2.6

2x - 2.6 = -2.6

Next, add 2.6 to both sides of the equation:

(2x - 2.6) + 2.6 = -2.6 + 2.6

2x = 0

Finally, divide both sides of the equation by 2 to solve for x:

(2x)/2 = 0/2

x = 0

So the solution to the equation is x = 0.

I hope this helps! Let me know if you have any further questions.