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13=7x+6-4x
We move all terms to the left:
13-(7x+6-4x)=0
We add all the numbers together, and all the variables
-(3x+6)+13=0
We get rid of parentheses
-3x-6+13=0
We add all the numbers together, and all the variables
-3x+7=0
We move all terms containing x to the left, all other terms to the right
-3x=-7
x=-7/-3
x=2+1/3
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