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k(k^2-9)-2(2k-9)+2(6-3k)=0
We add all the numbers together, and all the variables
k(k^2-9)-2(2k-9)+2(-3k+6)=0
We multiply parentheses
k^3-9k-4k-6k+18+12=0
We do not support ekpression: k^3
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