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-20=6a-38
We move all terms to the left:
-20-(6a-38)=0
We get rid of parentheses
-6a+38-20=0
We add all the numbers together, and all the variables
-6a+18=0
We move all terms containing a to the left, all other terms to the right
-6a=-18
a=-18/-6
a=+3
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