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7a/3=12
We move all terms to the left:
7a/3-(12)=0
We multiply all the terms by the denominator
7a-12*3=0
We add all the numbers together, and all the variables
7a-36=0
We move all terms containing a to the left, all other terms to the right
7a=36
a=36/7
a=5+1/7
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