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