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u in (-oo:+oo)
(u/1)/3 = 3/7 // - 3/7
(u/1)/3-(3/7) = 0
u/3-3/7 = 0
1/3*u-3/7 = 0 // + 3/7
1/3*u = 3/7 // : 1/3
u = 3/7/1/3
u = 9/7
u = 9/7
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