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a+2a-9=4a-3-3
We move all terms to the left:
a+2a-9-(4a-3-3)=0
We add all the numbers together, and all the variables
a+2a-(4a-6)-9=0
We add all the numbers together, and all the variables
3a-(4a-6)-9=0
We get rid of parentheses
3a-4a+6-9=0
We add all the numbers together, and all the variables
-1a-3=0
We move all terms containing a to the left, all other terms to the right
-a=3
a=3/-1
a=-3
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