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u in (-oo:+oo)
-3*u = 15/8 // - 15/8
-3*u-(15/8) = 0
-3*u-15/8 = 0
-3*u-15/8 = 0 // + 15/8
-3*u = 15/8 // : -3
u = 15/8/(-3)
u = -5/8
u = -5/8
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