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u in (-oo:+oo)
12 = u+4*u+3/6-(3/2) // - u+4*u+3/6-(3/2)
3/2-u-(4*u)-(3/6)+12 = 0
3/2-u-4*u-1/2+12 = 0
13-5*u = 0 // - 13
-5*u = -13 // : -5
u = -13/(-5)
u = 13/5
u = 13/5
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