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38=4a+2
We move all terms to the left:
38-(4a+2)=0
We get rid of parentheses
-4a-2+38=0
We add all the numbers together, and all the variables
-4a+36=0
We move all terms containing a to the left, all other terms to the right
-4a=-36
a=-36/-4
a=+9
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