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1+7a=9+8a
We move all terms to the left:
1+7a-(9+8a)=0
We add all the numbers together, and all the variables
7a-(8a+9)+1=0
We get rid of parentheses
7a-8a-9+1=0
We add all the numbers together, and all the variables
-1a-8=0
We move all terms containing a to the left, all other terms to the right
-a=8
a=8/-1
a=-8
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