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13=3x-2-6
We move all terms to the left:
13-(3x-2-6)=0
We add all the numbers together, and all the variables
-(3x-8)+13=0
We get rid of parentheses
-3x+8+13=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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