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42=a/4+38
We move all terms to the left:
42-(a/4+38)=0
We get rid of parentheses
-a/4-38+42=0
We multiply all the terms by the denominator
-a-38*4+42*4=0
We add all the numbers together, and all the variables
-1a+16=0
We move all terms containing a to the left, all other terms to the right
-a=-16
a=-16/-1
a=+16
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