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