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u in (-oo:+oo)
-12/7 = 4*u // - 4*u
-(4*u)-12/7 = 0
-4*u-12/7 = 0
-4*u-12/7 = 0 // + 12/7
-4*u = 12/7 // : -4
u = 12/7/(-4)
u = -3/7
u = -3/7
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