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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
12/12 = -1/q // + -1/q
12/12-(-1/q) = 0
q^-1+12/12 = 0
1*q^-1 = -1 // : 1
q^-1 = -1
-1 < 0
1/(q^1) = -1 // * q^1
1 = -1*q^1 // : -1
-1 = q^1
q = -1
q = -1
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