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u in (-oo:+oo)
u+2/2 = 3*u-(3/8)+2 // - 3*u-(3/8)+2
u-(3*u)+2/2+3/8-2 = 0
u-3*u+2/2+3/8-2 = 0
-2*u-5/8 = 0 // + 5/8
-2*u = 5/8 // : -2
u = 5/8/(-2)
u = -5/16
u = -5/16
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