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u in (-oo:+oo)
u/7 = 3/8 // - 3/8
u/7-(3/8) = 0
u/7-3/8 = 0
1/7*u-3/8 = 0 // + 3/8
1/7*u = 3/8 // : 1/7
u = 3/8/1/7
u = 21/8
u = 21/8
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