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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
u+1/u+1+3 = u+2/u-4 // - u+2/u-4
u-u+1/u-(2/u)+1+3+4 = 0
u-u+1/u-2*u^-1+1+3+4 = 0
-1*u^-1 = -8 // : -1
u^-1 = 8
-1 < 0
1/(u^1) = 8 // * u^1
1 = 8*u^1 // : 8
1/8 = u^1
u = 1/8
u = 1/8
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