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(6/7)*(x-2) = 42 // - 42
(6/7)*(x-2)-42 = 0
6/7*(x-2)-42 = 0
6/7*(x-2)-42 = 0
6/7*x-306/7 = 0
6/7*x-306/7 = 0
6/7*x-306/7 = 0 // + 306/7
6/7*x = 306/7 // : 6/7
x = 306/7/6/7
x = 51
x = 51
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