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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
7/u+8 = -4 // + 4
7/u+4+8 = 0
7*u^-1 = -12 // : 7
u^-1 = -12/7
-1 < 0
1/(u^1) = -12/7 // * u^1
1 = -12/7*u^1 // : -12/7
-7/12 = u^1
u = -7/12
u = -7/12
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