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3*(x-3) = 39/13 // - 39/13
3*(x-3)-(39/13) = 0
3*(x-3)-3 = 0
3*(x-3)-3 = 0
3*x-12 = 0
3*x-12 = 0
3*x-12 = 0 // + 12
3*x = 12 // : 3
x = 12/3
x = 4
x = 4
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