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8*x-(2*x)-(1/2) = 13 // - 13
8*x-(2*x)-(1/2)-13 = 0
8*x-2*x-1/2-13 = 0
6*x-27/2 = 0 // + 27/2
6*x = 27/2 // : 6
x = 27/2/6
x = 9/4
x = 9/4
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