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x2+800=x4+500
We move all terms to the left:
x2+800-(x4+500)=0
We add all the numbers together, and all the variables
-(+x^4+500)+x2+800=0
We add all the numbers together, and all the variables
x^2-(+x^4+500)+800=0
We get rid of parentheses
x^2-x^4-500+800=0
We do not support expression: x^4
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