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591=6a-9
We move all terms to the left:
591-(6a-9)=0
We get rid of parentheses
-6a+9+591=0
We add all the numbers together, and all the variables
-6a+600=0
We move all terms containing a to the left, all other terms to the right
-6a=-600
a=-600/-6
a=+100
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