Question

1)x+6,4=18 2)7x+11,9=0 3) 6x-0,8=3x+2,2 4)5x-(7x+7)=9

Answer 1

1) x=18-6.4
x=11.6
2) 7x=11.9 / :7
x=1.7
3) 6x- 3x=2.2+0.8
3x=3.0
x=1
4) 5x-7x-7=9
-2x=9+7
-2x=16/ : (-2)
x= - 8

Answer 2

1) Х=18-6,4=11,6

2)7Х=-11,9

Х=-11,9/7= -1,7

3)6Х-3Х=0,8+2,2

3Х=3

Х=1

4) -2Х=9-7

Х=2/-2=-1

Answer 3

To solve each of these equations, we'll isolate the variable x on one side of the equation. Let's go through them one by one:

1. x + 6.4 = 18

Subtract 6.4 from both sides to isolate x:

x = 18 - 6.4 x = 11.6

2. 7x + 11.9 = 0

Subtract 11.9 from both sides:

7x = -11.9

Now, divide both sides by 7 to solve for x:

x = -11.9 / 7 x = -1.7

3. 6x - 0.8 = 3x + 2.2

First, let's get all the x terms on one side by subtracting 3x from both sides:

6x - 3x - 0.8 = 2.2

Simplify the left side:

3x - 0.8 = 2.2

Now, add 0.8 to both sides:

3x = 2.2 + 0.8 3x = 3

Finally, divide by 3 to find the value of x:

x = 3 / 3 x = 1

4. 5x - (7x + 7) = 9

Start by simplifying the expression inside the parentheses:

5x - 7x - 7 = 9

Combine like terms:

-2x - 7 = 9

Now, isolate x by adding 7 to both sides:

-2x = 9 + 7 -2x = 16

To solve for x, divide both sides by -2:

x = 16 / -2 x = -8

So, the solutions to the equations are:

1. x = 11.6
2. x = -1.7
3. x = 1
4. x = -8