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y in (-oo:+oo)
(-8/9)*y = 1/5 // - 1/5
(-8/9)*y-(1/5) = 0
(-8/9)*y-1/5 = 0
-8/9*y-1/5 = 0 // + 1/5
-8/9*y = 1/5 // : -8/9
y = 1/5/(-8/9)
y = -9/40
y = -9/40
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