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u in (-oo:+oo)
42/28 = u/46 // - u/46
42/28-(u/46) = 0
3/2-1/46*u = 0 // - 3/2
-1/46*u = -3/2 // : -1/46
u = -3/2/(-1/46)
u = 69
u = 69
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