(a^4*b^7 -a^7*b^4)/a^3*b^3 =
=a^3*b^3(a*b^4 -a^4*b)/a^3*b^3 =
=a*b^4 -a^4*b =
= a*b(b^3 -a^3)
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(a^4*b^7 -a^7*b^4)/a^3*b^3 =
=a^3*b^3(a*b^4 -a^4*b)/a^3*b^3 =
=a*b^4 -a^4*b =
= a*b(b^3 -a^3)