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2a+7=4a-9
We move all terms to the left:
2a+7-(4a-9)=0
We get rid of parentheses
2a-4a+9+7=0
We add all the numbers together, and all the variables
-2a+16=0
We move all terms containing a to the left, all other terms to the right
-2a=-16
a=-16/-2
a=+8
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