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x in (-oo:+oo)
(5/6)*x-((3/11)*x)+7/8 = 0
(5/6)*x+(-3/11)*x+7/8 = 0
37/66*x+7/8 = 0 // - 7/8
37/66*x = -7/8 // : 37/66
x = -7/8/37/66
x = -231/148
x = -231/148
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