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x+3/4 = 5/14-x-(5/7) // - 5/14-x-(5/7)
x+x+3/4-(5/14)+5/7 = 0
x+x+3/4-5/14+5/7 = 0
2*x+31/28 = 0 // - 31/28
2*x = -31/28 // : 2
x = -31/28/2
x = -31/56
x = -31/56
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