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5a+9+6a=2a-18
We move all terms to the left:
5a+9+6a-(2a-18)=0
We add all the numbers together, and all the variables
11a-(2a-18)+9=0
We get rid of parentheses
11a-2a+18+9=0
We add all the numbers together, and all the variables
9a+27=0
We move all terms containing a to the left, all other terms to the right
9a=-27
a=-27/9
a=-3
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