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u in (-oo:+oo)
2-(3*(2*u-6)) = 4*(2*u-(1/4)) // - 4*(2*u-(1/4))
2-(3*(2*u-6))-(4*(2*u-(1/4))) = 0
2-3*(2*u-6)-4*(2*u-1/4) = 0
2-3*(2*u-6)-4*(2*u-1/4) = 0
2-14*u+19 = 0
21-14*u = 0
21-14*u = 0
21-14*u = 0 // - 21
-14*u = -21 // : -14
u = -21/(-14)
u = 3/2
u = 3/2
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