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(6/7)*x = 54/7 // - 54/7
(6/7)*x-(54/7) = 0
(6/7)*x-54/7 = 0
6/7*x-54/7 = 0 // + 54/7
6/7*x = 54/7 // : 6/7
x = 54/7/6/7
x = 9
x = 9
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