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5x+39=7x+13
We move all terms to the left:
5x+39-(7x+13)=0
We get rid of parentheses
5x-7x-13+39=0
We add all the numbers together, and all the variables
-2x+26=0
We move all terms containing x to the left, all other terms to the right
-2x=-26
x=-26/-2
x=+13
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