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u in (-oo:+oo)
7/13 = u/4 // - u/4
7/13-(u/4) = 0
7/13-1/4*u = 0 // - 7/13
-1/4*u = -7/13 // : -1/4
u = -7/13/(-1/4)
u = 28/13
u = 28/13
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