# 2 Answers

3x-2(4x+5)=x+2,then x=?

You need to get the ?X? all by itself on one side of the = sign.

Do the stuff in ( ) first. 3x - **2 (4x + 5) **= x + 2

You can't add 4x and 5, because you don't know what x is, but you CAN multiply 2 x 4x and 2 x 5.

3x - 8x - 10 = x + 2

3x - 8x is -5x

-5x - 10 = x + 2

Get the 10 away from the -5x. You do this by adding 10 (but what you do on one side of the = sign, you must do on the other side) -5x - 10 + 10 = x + 2 + 10

-5x = x + 12

NOW, get rid of the x + 12 by subtracting x. Subtract x from BOTH sides: -5x -x = x - x + 12

-6x + 12. Divide both sides by -6 to get x all by itself. -6x/-6 = 12/-6

x = -2 (negative divided by negative = positive)

Check your work by putting -2 where "x" was in the original equation.

10 years ago. Rating: 3 | |

x=1.5

10 years ago. Rating: 0 | |