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u in (-oo:+oo)
-12/7 = 6*u // - 6*u
-(6*u)-12/7 = 0
-6*u-12/7 = 0
-6*u-12/7 = 0 // + 12/7
-6*u = 12/7 // : -6
u = 12/7/(-6)
u = -2/7
u = -2/7
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