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(3/7)*x+3/4 = 6/7 // - 6/7
(3/7)*x+3/4-(6/7) = 0
(3/7)*x+3/4-6/7 = 0
3/7*x-3/28 = 0 // + 3/28
3/7*x = 3/28 // : 3/7
x = 3/28/3/7
x = 1/4
x = 1/4
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