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y in (-oo:+oo)
(4/9)*y = 1/5 // - 1/5
(4/9)*y-(1/5) = 0
(4/9)*y-1/5 = 0
4/9*y-1/5 = 0 // + 1/5
4/9*y = 1/5 // : 4/9
y = 1/5/4/9
y = 9/20
y = 9/20
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