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13+2x=39.
We move all terms to the left:
13+2x-(39.)=0
We add all the numbers together, and all the variables
2x+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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