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y in (-oo:+oo)
(7/8)*y = 7/9 // - 7/9
(7/8)*y-(7/9) = 0
(7/8)*y-7/9 = 0
7/8*y-7/9 = 0 // + 7/9
7/8*y = 7/9 // : 7/8
y = 7/9/7/8
y = 8/9
y = 8/9
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