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w(w+20)(2w+10)=2000000
We move all terms to the left:
w(w+20)(2w+10)-(2000000)=0
We multiply parentheses ..
w(+2w^2+10w+40w+200)-2000000=0
We multiply parentheses
2w^3+10w^2+40w^2+200w-2000000=0
We do not support ewpression: w^3
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