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y in (-oo:+oo)
-25 = (-5/4)*y // - (-5/4)*y
-((-5/4)*y)-25 = 0
(5/4)*y-25 = 0
5/4*y-25 = 0 // + 25
5/4*y = 25 // : 5/4
y = 25/5/4
y = 20
y = 20
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