4(a+b)-6(a+b)(a+b) factorise
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4(a+b)-6(a+b)(a+b)
=2(a+b) [2(a+b)-3(a+b)]
=2(a+b) (a+b) (2-3)
=2(a+b) [2(a+b)-3(a+b)]
=2(a+b) (a+b) (2-3)
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