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3=a-18-8
We move all terms to the left:
3-(a-18-8)=0
We add all the numbers together, and all the variables
-(a-26)+3=0
We get rid of parentheses
-a+26+3=0
We add all the numbers together, and all the variables
-1a+29=0
We move all terms containing a to the left, all other terms to the right
-a=-29
a=-29/-1
a=+29
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