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x4=x3+2
We move all terms to the left:
x4-(x3+2)=0
We add all the numbers together, and all the variables
-(+x^3+2)+x4=0
We add all the numbers together, and all the variables
x^4-(+x^3+2)=0
We get rid of parentheses
x^4-x^3-2=0
We do not support expression: x^4
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