2 [ 15 - 4 ( 3 x - 8 ) ] - 7 = 3 [ 18 - 5 ( 2 x - 3 ) ] + 18
2 ( 15 - 12 x + 32 ) - 7 = 3 ( 18 - 10 x + 15 ) + 18
2 ( 47 - 12 x ) - 7 = 3 ( 33 - 10 x ) + 18
94 - 24 x - 7 = 99 - 30 x + 18
- 24 x + 87 = - 30 x + 117
- 24 x + 30 x = 117 - 87
6 x = 30
x = 30 : 6
x = 5
