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y in (-oo:+oo)
(7/8)*y = 1/3 // - 1/3
(7/8)*y-(1/3) = 0
(7/8)*y-1/3 = 0
7/8*y-1/3 = 0 // + 1/3
7/8*y = 1/3 // : 7/8
y = 1/3/7/8
y = 8/21
y = 8/21
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