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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
20/q = 45/36 // - 45/36
20/q-(45/36) = 0
20/q-5/4 = 0
20*q^-1 = 5/4 // : 20
q^-1 = 1/16
-1 < 0
1/(q^1) = 1/16 // * q^1
1 = 1/16*q^1 // : 1/16
16 = q^1
q = 16
q = 16
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