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