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X in (-oo:+oo)
7*X+(2*X)/6+86 = 166 // - 166
7*X+(2*X)/6-166+86 = 0
22/3*X-80 = 0 // + 80
22/3*X = 80 // : 22/3
X = 80/22/3
X = 120/11
X = 120/11
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