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-2a+7=a+8
We move all terms to the left:
-2a+7-(a+8)=0
We get rid of parentheses
-2a-a-8+7=0
We add all the numbers together, and all the variables
-3a-1=0
We move all terms containing a to the left, all other terms to the right
-3a=1
a=1/-3
a=-1/3
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