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(x+1)(x+1)=9+x*x
We move all terms to the left:
(x+1)(x+1)-(9+x*x)=0
We add all the numbers together, and all the variables
(x+1)(x+1)-(x*x+9)=0
We get rid of parentheses
(x+1)(x+1)-x*x-9=0
We multiply parentheses ..
(+x^2+x+x+1)-x*x-9=0
Wy multiply elements
(+x^2+x+x+1)-1x^2-9=0
We get rid of parentheses
x^2-1x^2+x+x+1-9=0
We add all the numbers together, and all the variables
2x-8=0
We move all terms containing x to the left, all other terms to the right
2x=8
x=8/2
x=4
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