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X in (-oo:+oo)
X+14/5 = X/7 // - X/7
X-(X/7)+14/5 = 0
6/7*X+14/5 = 0 // - 14/5
6/7*X = -14/5 // : 6/7
X = -14/5/6/7
X = -49/15
X = -49/15
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