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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
13 = 52/q // - 52/q
13-(52/q) = 0
13-52*q^-1 = 0
-52*q^-1 = -13 // : -52
q^-1 = 1/4
-1 < 0
1/(q^1) = 1/4 // * q^1
1 = 1/4*q^1 // : 1/4
4 = q^1
q = 4
q = 4
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