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(3/4)*x-(2/3) = 4/7 // - 4/7
(3/4)*x-(2/3)-(4/7) = 0
(3/4)*x-2/3-4/7 = 0
3/4*x-26/21 = 0 // + 26/21
3/4*x = 26/21 // : 3/4
x = 26/21/3/4
x = 104/63
x = 104/63
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