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u in (-oo:+oo)
-5*u = 15/7 // - 15/7
-5*u-(15/7) = 0
-5*u-15/7 = 0
-5*u-15/7 = 0 // + 15/7
-5*u = 15/7 // : -5
u = 15/7/(-5)
u = -3/7
u = -3/7
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