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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-2=0
We move all terms containing a to the left, all other terms to the right
4a=2
a=2/4
a=1/2
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