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(3/4)*x-(2/7) = 1/4 // - 1/4
(3/4)*x-(2/7)-(1/4) = 0
(3/4)*x-2/7-1/4 = 0
3/4*x-15/28 = 0 // + 15/28
3/4*x = 15/28 // : 3/4
x = 15/28/3/4
x = 5/7
x = 5/7
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