Question

4x+7=12x+9 -(x+5)-(3x-8)=-4 4(5x-2)+5x=27

Answer 1

Ответ:

1) -8x=2

x=-0.25

2)-x-5-3x+8=-4

x=1.75

3)20x-8+5x=27

x=35/25

x=1.4

Answer 2

Let's solve each of the equations step by step:

1. 4x + 7 = 12x + 9

First, let's simplify the equation by combining like terms:

4x - 12x = 9 - 7 -8x = 2

Now, divide both sides of the equation by -8 to isolate x:

x = 2 / -8 x = -1/4

So, the solution to the equation is x = -1/4.

2. -(x + 5) - (3x - 8) = -4

First, let's simplify the equation by removing the parentheses:

-1(x) - 1(5) - 1(3x) - 1(-8) = -4

Simplify further:

-x - 5 - 3x + 8 = -4

Combine like terms:

-4x + 3 = -4

Now, let's isolate x by moving the constants to the other side:

-4x = -4 - 3 -4x = -7

Divide both sides by -4 to find the value of x:

x = -7 / -4 x = 7/4 or 1.75

So, the solution to the equation is x = 7/4 or 1.75.

3. 4(5x - 2) + 5x = 27

First, let's distribute the 4 to the terms inside the parentheses:

20x - 8 + 5x = 27

Combine like terms:

25x - 8 = 27

Now, isolate x by moving the constant to the other side:

25x = 27 + 8 25x = 35

Divide both sides by 25 to find the value of x:

x = 35 / 25 x = 7/5 or 1.4

So, the solution to the equation is x = 7/5 or 1.4.

In summary, the solutions to the given equations are:

1. x = -1/4
2. x = 7/4 or 1.75
3. x = 7/5 or 1.4