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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
18/q = 12/32 // - 12/32
18/q-(12/32) = 0
18/q-3/8 = 0
18*q^-1 = 3/8 // : 18
q^-1 = 1/48
-1 < 0
1/(q^1) = 1/48 // * q^1
1 = 1/48*q^1 // : 1/48
48 = q^1
q = 48
q = 48
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