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u in (-oo:+oo)
-12 = (-6/5)*u // - (-6/5)*u
-((-6/5)*u)-12 = 0
(6/5)*u-12 = 0
6/5*u-12 = 0 // + 12
6/5*u = 12 // : 6/5
u = 12/6/5
u = 10
u = 10
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