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5*x-(3*x)-(4/2) = 12 // - 12
5*x-(3*x)-(4/2)-12 = 0
5*x-3*x-12-2 = 0
2*x-14 = 0 // + 14
2*x = 14 // : 2
x = 14/2
x = 7
x = 7
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