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X in (-oo:+oo)
3*X+X+12/4+27/7 = 14 // - 14
3*X+X+12/4+27/7-14 = 0
4*X-50/7 = 0 // + 50/7
4*X = 50/7 // : 4
X = 50/7/4
X = 25/14
X = 25/14
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