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18a-11a=4a-36
We move all terms to the left:
18a-11a-(4a-36)=0
We add all the numbers together, and all the variables
7a-(4a-36)=0
We get rid of parentheses
7a-4a+36=0
We add all the numbers together, and all the variables
3a+36=0
We move all terms containing a to the left, all other terms to the right
3a=-36
a=-36/3
a=-12
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