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(3*x-6)/2 = 12 // - 12
(3*x-6)/2-12 = 0
(3*x-6)/2+(-12*2)/2 = 0
3*x-12*2-6 = 0
3*x-30 = 0
(3*x-30)/2 = 0
(3*x-30)/2 = 0 // * 2
3*x-30 = 0
3*x-30 = 0 // + 30
3*x = 30 // : 3
x = 30/3
x = 10
x = 10
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