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13/2 = 3*x-(6*x)+8 // - 3*x-(6*x)+8
6*x-(3*x)+13/2-8 = 0
6*x-3*x+13/2-8 = 0
3*x-3/2 = 0 // + 3/2
3*x = 3/2 // : 3
x = 3/2/3
x = 1/2
x = 1/2
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