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x in (-oo:+oo)
(5/6)*x-((3/7)*x)+7/8 = 0
(5/6)*x+(-3/7)*x+7/8 = 0
17/42*x+7/8 = 0 // - 7/8
17/42*x = -7/8 // : 17/42
x = -7/8/17/42
x = -147/68
x = -147/68
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