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8x^2+112x+392=8x^2+112x+392
We move all terms to the left:
8x^2+112x+392-(8x^2+112x+392)=0
We get rid of parentheses
8x^2-8x^2+112x-112x-392+392=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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