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3*(x-6) = 78/13 // - 78/13
3*(x-6)-(78/13) = 0
3*(x-6)-6 = 0
3*(x-6)-6 = 0
3*x-18-6 = 0
3*x-18-6 = 0
3*x-18-6 = 0 // + -18-6
3*x = -(-18-6) // : 3
x = (-(-18-6))/3
x = (6+18)/3
x = (6+18)/3
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