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23x+x^2=x^2+121
We move all terms to the left:
23x+x^2-(x^2+121)=0
We get rid of parentheses
x^2-x^2+23x-121=0
We add all the numbers together, and all the variables
23x-121=0
We move all terms containing x to the left, all other terms to the right
23x=121
x=121/23
x=5+6/23
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