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k3-13k=-7-15k^2
We move all terms to the left:
k3-13k-(-7-15k^2)=0
We add all the numbers together, and all the variables
k^3-(-7-15k^2)-13k=0
We get rid of parentheses
k^3+15k^2-13k+7=0
We do not support ekpression: k^3
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