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2a-6=-2a
We move all terms to the left:
2a-6-(-2a)=0
We get rid of parentheses
2a+2a-6=0
We add all the numbers together, and all the variables
4a-6=0
We move all terms containing a to the left, all other terms to the right
4a=6
a=6/4
a=1+1/2
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