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u in (-oo:+oo)
-15 = (11/(-12))*u // - (11/(-12))*u
-((11/(-12))*u)-15 = 0
(11/12)*u-15 = 0
11/12*u-15 = 0 // + 15
11/12*u = 15 // : 11/12
u = 15/11/12
u = 180/11
u = 180/11
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