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y in (-oo:+oo)
-8/10 = y/5 // - y/5
-(y/5)-8/10 = 0
-1/5*y-4/5 = 0 // + 4/5
-1/5*y = 4/5 // : -1/5
y = 4/5/(-1/5)
y = -4
y = -4
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