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(x - 1) / 3 = x/2 + 6/2
(x - 1) / 3 = (x + 6) / 2
2x - 2 = 3x + 18
-x = 20
x = - 20
d.>>>
10x - 7 = 8 - 5x
15x = 15
x = 1
semoga membantu ^_^