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(1/2)*(6*x-12) = 12 // - 12
(1/2)*(6*x-12)-12 = 0
1/2*(6*x-12)-12 = 0
1/2*(6*x-12)-12 = 0
3*x-18 = 0
3*x-18 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x = 6
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