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y in (-oo:+oo)
-20 = (-5/9)*y // - (-5/9)*y
-((-5/9)*y)-20 = 0
(5/9)*y-20 = 0
5/9*y-20 = 0 // + 20
5/9*y = 20 // : 5/9
y = 20/5/9
y = 36
y = 36
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