6x+30 - (9x-18) = -2x+8

6x+30 - (9x-18) = -2x+8
6x+30 - 9x + 18 = -2x+8
               -3x+48=-2x+8
                  48-8=2x+3x
                     40=5x
[tex] \frac{40}{5} [/tex]=x
8=x

6x+30-(9x-18) = -2x+8
⇔6x+30-9x+18 = -2x+8
⇔6x-9x+2x = 8-30-18
⇔-1x = -40
⇔x = [tex] \frac{-40}{-1} [/tex]
⇔x = 40