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u in (-oo:+oo)
-15*(-1/15)*u = 15*(-1/15) // - 15*(-1/15)
-15*(-1/15)*u-(15*(-1/15)) = 0
1-15*(-1/15)*u = 0
u+1 = 0 // - 1
u = -1
u = -1
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