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(5+x)(5+x)=5+x2
We move all terms to the left:
(5+x)(5+x)-(5+x2)=0
We add all the numbers together, and all the variables
-(+x^2+5)+(x+5)(x+5)=0
We get rid of parentheses
-x^2+(x+5)(x+5)-5=0
We multiply parentheses ..
-x^2+(+x^2+5x+5x+25)-5=0
We add all the numbers together, and all the variables
-1x^2+(+x^2+5x+5x+25)-5=0
We get rid of parentheses
-1x^2+x^2+5x+5x+25-5=0
We add all the numbers together, and all the variables
10x+20=0
We move all terms containing x to the left, all other terms to the right
10x=-20
x=-20/10
x=-2
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