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w(w+3)(-w-7)=0
We add all the numbers together, and all the variables
w(w+3)(-1w-7)=0
We multiply parentheses ..
w(-1w^2-7w-3w-21)=0
We multiply parentheses
-1w^3-7w^2-3w^2-21w=0
We do not support ewpression: w^3
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