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(6/7)*(3*x-9) = 18 // - 18
(6/7)*(3*x-9)-18 = 0
6/7*(3*x-9)-18 = 0
6/7*(3*x-9)-18 = 0
18/7*x-180/7 = 0
18/7*x-180/7 = 0
18/7*x-180/7 = 0 // + 180/7
18/7*x = 180/7 // : 18/7
x = 180/7/18/7
x = 10
x = 10
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