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y in (-oo:+oo)
-10 = (-5/2)*y // - (-5/2)*y
-((-5/2)*y)-10 = 0
(5/2)*y-10 = 0
5/2*y-10 = 0 // + 10
5/2*y = 10 // : 5/2
y = 10/5/2
y = 4
y = 4
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