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u in (-oo:+oo)
(5*u)/4-3 = (7*u)/6 // - (7*u)/6
(5*u)/4-((7*u)/6)-3 = 0
(5*u)/4+(-7/6)*u-3 = 0
1/12*u-3 = 0 // + 3
1/12*u = 3 // : 1/12
u = 3/1/12
u = 36
u = 36
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