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= p^6 q^7 : (((-p):p)^5-2 q^3-1)
=p^6 q^7 : (-1)^3 q²
= p^6 q^7 : (-1) q²
= p^6 q^7 : (-q)²
= p^6 (q:(-q))^7-2
= p^6 (-1)^5
= p^6 (-1)
= -p^6