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u in (-oo:+oo)
-12/5 = 6*u // - 6*u
-(6*u)-12/5 = 0
-6*u-12/5 = 0
-6*u-12/5 = 0 // + 12/5
-6*u = 12/5 // : -6
u = 12/5/(-6)
u = -2/5
u = -2/5
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