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