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y in (-oo:+oo)
(4/5)*y = 8/9 // - 8/9
(4/5)*y-(8/9) = 0
(4/5)*y-8/9 = 0
4/5*y-8/9 = 0 // + 8/9
4/5*y = 8/9 // : 4/5
y = 8/9/4/5
y = 10/9
y = 10/9
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