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X in (-oo:+oo)
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-51/28 = 0 // + 51/28
2*X = 51/28 // : 2
X = 51/28/2
X = 51/56
X = 51/56
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