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-13x^2x=-39+12x
We move all terms to the left:
-13x^2x-(-39+12x)=0
We add all the numbers together, and all the variables
-13x^2x-(12x-39)=0
We get rid of parentheses
-13x^2x-12x+39=0
We move all terms containing x to the left, all other terms to the right
-13x^2x-12x=-39
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