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7-(a+2)=9+a
We move all terms to the left:
7-(a+2)-(9+a)=0
We add all the numbers together, and all the variables
-(a+2)-(a+9)+7=0
We get rid of parentheses
-a-a-2-9+7=0
We add all the numbers together, and all the variables
-2a-4=0
We move all terms containing a to the left, all other terms to the right
-2a=4
a=4/-2
a=-2
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