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y in (-oo:+oo)
-4/5 = 3*y // - 3*y
-(3*y)-4/5 = 0
-3*y-4/5 = 0
-3*y-4/5 = 0 // + 4/5
-3*y = 4/5 // : -3
y = 4/5/(-3)
y = -4/15
y = -4/15
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