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