How do you combine like terms in #9- 4( - a + 9) + 3( 7- 2a)#?

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Answer 1 · 2017-04-17T04:49:20

#-2a-6#

Expand through the brackets,

#9+4a-36+21-6a#

Combine like terms,

#9+21-36=-6#

#4a-6a=-2a#

Combine for the final answer,

#-2a-6# or #-2(a+3)#