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u in (-oo:+oo)
-3*u = 1/5 // - 1/5
-3*u-(1/5) = 0
-3*u-1/5 = 0
-3*u-1/5 = 0 // + 1/5
-3*u = 1/5 // : -3
u = 1/5/(-3)
u = -1/15
u = -1/15
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