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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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