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(4/7)*x-6 = 6/7 // - 6/7
(4/7)*x-(6/7)-6 = 0
(4/7)*x-6/7-6 = 0
4/7*x-48/7 = 0 // + 48/7
4/7*x = 48/7 // : 4/7
x = 48/7/4/7
x = 12
x = 12
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