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-13+3x=39+9x
We move all terms to the left:
-13+3x-(39+9x)=0
We add all the numbers together, and all the variables
3x-(9x+39)-13=0
We get rid of parentheses
3x-9x-39-13=0
We add all the numbers together, and all the variables
-6x-52=0
We move all terms containing x to the left, all other terms to the right
-6x=52
x=52/-6
x=-8+2/3
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