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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
u+(2/3)*u-1+1 = 1-(u/u)+6 // - 1-(u/u)+6
u+(2/3)*u+u/u-6-1-1+1 = 0
5/3*u-6 = 0 // + 6
5/3*u = 6 // : 5/3
u = 6/5/3
u = 18/5
u = 18/5
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