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x4-16x^2=x2+18
We move all terms to the left:
x4-16x^2-(x2+18)=0
We add all the numbers together, and all the variables
-16x^2-(+x^2+18)+x4=0
We add all the numbers together, and all the variables
-16x^2+x^4-(+x^2+18)=0
We get rid of parentheses
-16x^2+x^4-x^2-18=0
We do not support expression: x^4
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