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