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u in (-oo:+oo)
3/13 = u/10 // - u/10
3/13-(u/10) = 0
3/13-1/10*u = 0 // - 3/13
-1/10*u = -3/13 // : -1/10
u = -3/13/(-1/10)
u = 30/13
u = 30/13
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