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