Question

3 (2x-3) + 2(x+1)=3x+18 ?

Answer 1

3 ( 2 x - 3 ) + 2 ( x + 1 ) = 3 x + 18
6 x - 9 + 2 x + 2 = 3 x + 18
8 x - 3 x = 18 + 9 - 2
5 x = 25
x = 25 / 5
x = 5

Answer 2

Vamos resolver a equação 
3(2x - 3) + 2(x + 1) = 3x + 18 ⇒ 
6x - 9 + 2x + 2 = 3x + 18 ⇒
8x - 7 = 3x + 18
5x = 25 
x = 5