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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
42/q = 6 // - 6
42/q-6 = 0
42*q^-1 = 6 // : 42
q^-1 = 1/7
-1 < 0
1/(q^1) = 1/7 // * q^1
1 = 1/7*q^1 // : 1/7
7 = q^1
q = 7
q = 7
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