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