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3=+6+a
We move all terms to the left:
3-(+6+a)=0
We add all the numbers together, and all the variables
-(a+6)+3=0
We get rid of parentheses
-a-6+3=0
We add all the numbers together, and all the variables
-1a-3=0
We move all terms containing a to the left, all other terms to the right
-a=3
a=3/-1
a=-3
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