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(3/5)*x-(6/7) = 12 // - 12
(3/5)*x-(6/7)-12 = 0
(3/5)*x-6/7-12 = 0
3/5*x-90/7 = 0 // + 90/7
3/5*x = 90/7 // : 3/5
x = 90/7/3/5
x = 150/7
x = 150/7
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