Question 634926
Please post <u><b>one</b></u> problem at a time.


{{{2a-4(a+b)-(a-b)}}}


{{{2a-4a-4b-a+b}}}


{{{-3a-3b}}}

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So 


{{{2a-4(a+b)-(a-b)}}}


simplifies to


{{{-3a-3b}}}