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-2a+18+6a=5a-7a
We move all terms to the left:
-2a+18+6a-(5a-7a)=0
We add all the numbers together, and all the variables
-2a+6a-(-2a)+18=0
We add all the numbers together, and all the variables
4a-(-2a)+18=0
We get rid of parentheses
4a+2a+18=0
We add all the numbers together, and all the variables
6a+18=0
We move all terms containing a to the left, all other terms to the right
6a=-18
a=-18/6
a=-3
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