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