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