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