Factorise a to the power 7 and ab to the power 6
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a ^7 - ab ^6
a ×a ^6 - a × b ^6
a ( a^6- b ^6)
a( a^3- b ^3) ( a^3 + b3)
a(a -b ) (a2+ ab + b2) ( a+b) (a2- ab + b2)
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