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X in (-oo:+oo)
(5/6)*X-((2/11)*X)+6/7 = 0
(5/6)*X+(-2/11)*X+6/7 = 0
43/66*X+6/7 = 0 // - 6/7
43/66*X = -6/7 // : 43/66
X = -6/7/43/66
X = -396/301
X = -396/301
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