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-2a-7=9+2a
We move all terms to the left:
-2a-7-(9+2a)=0
We add all the numbers together, and all the variables
-2a-(2a+9)-7=0
We get rid of parentheses
-2a-2a-9-7=0
We add all the numbers together, and all the variables
-4a-16=0
We move all terms containing a to the left, all other terms to the right
-4a=16
a=16/-4
a=-4
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