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x+2x+13+2x+4x^2x=39
We move all terms to the left:
x+2x+13+2x+4x^2x-(39)=0
We add all the numbers together, and all the variables
4x^2x+5x-26=0
We move all terms containing x to the left, all other terms to the right
4x^2x+5x=26
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