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x^2+64=x^2+8x+16
We move all terms to the left:
x^2+64-(x^2+8x+16)=0
We get rid of parentheses
x^2-x^2-8x-16+64=0
We add all the numbers together, and all the variables
-8x+48=0
We move all terms containing x to the left, all other terms to the right
-8x=-48
x=-48/-8
x=+6
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