X+x2+x3=840

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Solution for X+x2+x3=840 equation: 



X+X2+X3=840

We move all terms to the left:

X+X2+X3-(840)=0

We add all the numbers together, and all the variables

X^2+X^3+X-840=0

We do not support eXpression: X^3

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