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u in (-oo:+oo)
(7*u)/10-(3/1) = (3*u)/4 // - (3*u)/4
(7*u)/10-((3*u)/4)-(3/1) = 0
(7*u)/10+(-3/4)*u-3 = 0
-1/20*u-3 = 0 // + 3
-1/20*u = 3 // : -1/20
u = 3/(-1/20)
u = -60
u = -60
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