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u in (-oo:+oo)
(5*u)/6+2 = (7*u)/10 // - (7*u)/10
(5*u)/6-((7*u)/10)+2 = 0
(5*u)/6+(-7/10)*u+2 = 0
2/15*u+2 = 0 // - 2
2/15*u = -2 // : 2/15
u = -2/2/15
u = -15
u = -15
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