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x in (-oo:+oo)
(-5/6)*x = -7/8 // + -7/8
(-5/6)*x-(-7/8) = 0
(-5/6)*x+7/8 = 0
7/8-5/6*x = 0 // - 7/8
-5/6*x = -7/8 // : -5/6
x = -7/8/(-5/6)
x = 21/20
x = 21/20
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