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12+a/2=14
We move all terms to the left:
12+a/2-(14)=0
We add all the numbers together, and all the variables
a/2-2=0
We multiply all the terms by the denominator
a-2*2=0
We add all the numbers together, and all the variables
a-4=0
We move all terms containing a to the left, all other terms to the right
a=4
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