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9=4a-3-4
We move all terms to the left:
9-(4a-3-4)=0
We add all the numbers together, and all the variables
-(4a-7)+9=0
We get rid of parentheses
-4a+7+9=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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