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