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y in (-oo:+oo)
(7/9)*y = 4/5 // - 4/5
(7/9)*y-(4/5) = 0
(7/9)*y-4/5 = 0
7/9*y-4/5 = 0 // + 4/5
7/9*y = 4/5 // : 7/9
y = 4/5/7/9
y = 36/35
y = 36/35
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