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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
4.8/q = 0.2 // - 0.2
4.8/q-0.2 = 0
4.8*q^-1 = 0.2 // : 4.8
q^-1 = 0.04166667
-1 < 0
1/(q^1) = 0.04166667 // * q^1
1 = 0.04166667*q^1 // : 0.04166667
23.99999808 = q^1
q = 23.99999808
q = 23.99999808
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