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100=8a+1
We move all terms to the left:
100-(8a+1)=0
We get rid of parentheses
-8a-1+100=0
We add all the numbers together, and all the variables
-8a+99=0
We move all terms containing a to the left, all other terms to the right
-8a=-99
a=-99/-8
a=12+3/8
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