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u in (-oo:+oo)
14 = 3*u+2*u+6/4-(3/2) // - 3*u+2*u+6/4-(3/2)
3/2-(3*u)-(2*u)-(6/4)+14 = 0
3/2-3*u-2*u-3/2+14 = 0
14-5*u = 0 // - 14
-5*u = -14 // : -5
u = -14/(-5)
u = 14/5
u = 14/5
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