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39-6x=13+7x
We move all terms to the left:
39-6x-(13+7x)=0
We add all the numbers together, and all the variables
-6x-(7x+13)+39=0
We get rid of parentheses
-6x-7x-13+39=0
We add all the numbers together, and all the variables
-13x+26=0
We move all terms containing x to the left, all other terms to the right
-13x=-26
x=-26/-13
x=+2
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