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1+a/12=2
We move all terms to the left:
1+a/12-(2)=0
We add all the numbers together, and all the variables
a/12-1=0
We multiply all the terms by the denominator
a-1*12=0
We add all the numbers together, and all the variables
a-12=0
We move all terms containing a to the left, all other terms to the right
a=12
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