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u in (-oo:+oo)
u/3 = 10/5 // - 10/5
u/3-(10/5) = 0
u/3-2 = 0
1/3*u-2 = 0 // + 2
1/3*u = 2 // : 1/3
u = 2/1/3
u = 6
u = 6
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