x^2+2x+1=841+x^2

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Solution for x^2+2x+1=841+x^2 equation: 



x^2+2x+1=841+x^2

We move all terms to the left:

x^2+2x+1-(841+x^2)=0

We get rid of parentheses

x^2-x^2+2x-841+1=0

We add all the numbers together, and all the variables

2x-840=0

We move all terms containing x to the left, all other terms to the right

2x=840

x=840/2

x=420

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