factorise : a (a+b-c) -bc
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a(a+b)-c(a+b)
(a-c)(a+b) is your required answer bro
=a^2+ab-ac-bc
=(a^2+ab)+(-ac-bc)
=a(a+b)-c(a+b) (by taking common)
=(a+b)(a-c)
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