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(1/2)*(4*x-8) = 12 // - 12
(1/2)*(4*x-8)-12 = 0
1/2*(4*x-8)-12 = 0
1/2*(4*x-8)-12 = 0
2*x-16 = 0
2*x-16 = 0
2*x-16 = 0 // + 16
2*x = 16 // : 2
x = 16/2
x = 8
x = 8
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