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18=-a=2
We move all terms to the left:
18-(-a)=0
We add all the numbers together, and all the variables
-(-1a)+18=0
We get rid of parentheses
1a+18=0
We add all the numbers together, and all the variables
a+18=0
We move all terms containing a to the left, all other terms to the right
a=-18
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