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5=3x^2x+13
We move all terms to the left:
5-(3x^2x+13)=0
We get rid of parentheses
-3x^2x-13+5=0
We add all the numbers together, and all the variables
-3x^2x-8=0
We move all terms containing x to the left, all other terms to the right
-3x^2x=8
x=8/1
x=8
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