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-6=-2a+a
We move all terms to the left:
-6-(-2a+a)=0
We add all the numbers together, and all the variables
-(-1a)-6=0
We get rid of parentheses
1a-6=0
We add all the numbers together, and all the variables
a-6=0
We move all terms containing a to the left, all other terms to the right
a=6
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