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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
9/u = 17.3 // - 17.3
9/u-17.3 = 0
9*u^-1 = 17.3 // : 9
u^-1 = 1.92222222
-1 < 0
1/(u^1) = 1.92222222 // * u^1
1 = 1.92222222*u^1 // : 1.92222222
0.52023121 = u^1
u = 0.52023121
u = 0.52023121
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