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20=6a-16
We move all terms to the left:
20-(6a-16)=0
We get rid of parentheses
-6a+16+20=0
We add all the numbers together, and all the variables
-6a+36=0
We move all terms containing a to the left, all other terms to the right
-6a=-36
a=-36/-6
a=+6
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