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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
q-((3*(3/(-5))*q)/q)-7 = 0
q+9/5-7 = 0
q-26/5 = 0 // + 26/5
q = 26/5
q = 26/5
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