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