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10a=1-8a=81
We move all terms to the left:
10a-(1-8a)=0
We add all the numbers together, and all the variables
10a-(-8a+1)=0
We get rid of parentheses
10a+8a-1=0
We add all the numbers together, and all the variables
18a-1=0
We move all terms containing a to the left, all other terms to the right
18a=1
a=1/18
a=1/18
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