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y in (-oo:+oo)
-5/2 = y/8 // - y/8
-(y/8)-5/2 = 0
-1/8*y-5/2 = 0 // + 5/2
-1/8*y = 5/2 // : -1/8
y = 5/2/(-1/8)
y = -20
y = -20
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