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u in (-oo:+oo)
u/7-(3*u)+5/7 = 0
u/7-3*u+5/7 = 0
5/7-20/7*u = 0 // - 5/7
-20/7*u = -5/7 // : -20/7
u = -5/7/(-20/7)
u = 1/4
u = 1/4
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