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4x+5x-13=39-4x
We move all terms to the left:
4x+5x-13-(39-4x)=0
We add all the numbers together, and all the variables
4x+5x-(-4x+39)-13=0
We add all the numbers together, and all the variables
9x-(-4x+39)-13=0
We get rid of parentheses
9x+4x-39-13=0
We add all the numbers together, and all the variables
13x-52=0
We move all terms containing x to the left, all other terms to the right
13x=52
x=52/13
x=4
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