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(6/7)*(2*x-12) = 12/7 // - 12/7
(6/7)*(2*x-12)-(12/7) = 0
(6/7)*(2*x-12)-12/7 = 0
6/7*(2*x-12)-12/7 = 0
(6/7*7*(2*x-12))/7-12/7 = 0
6/7*7*(2*x-12)-12 = 0
12*x-84 = 0
(12*x-84)/7 = 0
(12*x-84)/7 = 0 // * 7
12*x-84 = 0
12*x-84 = 0 // + 84
12*x = 84 // : 12
x = 84/12
x = 7
x = 7
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