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(p^1/3 q^-1/2 r^-3)6 : (p^-1/2 q^1/3 r^5/3)-12
p^2 q^-3 r^-18 : p^6 q^-4 r^-20
p^2-6 q^-3-(-4) r^-18-(-20)
p^-4 qr^2 (D)