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