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-10=8-a
We move all terms to the left:
-10-(8-a)=0
We add all the numbers together, and all the variables
-(-1a+8)-10=0
We get rid of parentheses
1a-8-10=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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