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20=a+6-39
We move all terms to the left:
20-(a+6-39)=0
We add all the numbers together, and all the variables
-(a-33)+20=0
We get rid of parentheses
-a+33+20=0
We add all the numbers together, and all the variables
-1a+53=0
We move all terms containing a to the left, all other terms to the right
-a=-53
a=-53/-1
a=+53
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