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(6/13)*(x-3) = 18 // - 18
(6/13)*(x-3)-18 = 0
6/13*(x-3)-18 = 0
6/13*(x-3)-18 = 0
6/13*x-252/13 = 0
6/13*x-252/13 = 0
6/13*x-252/13 = 0 // + 252/13
6/13*x = 252/13 // : 6/13
x = 252/13/6/13
x = 42
x = 42
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