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(4/2)*(2*x-1) = 12 // - 12
(4/2)*(2*x-1)-12 = 0
2*(2*x-1)-12 = 0
2*(2*x-1)-12 = 0
4*x-14 = 0
4*x-14 = 0
4*x-14 = 0 // + 14
4*x = 14 // : 4
x = 14/4
x = 7/2
x = 7/2
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