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Mathematics, 20.11.2020 01:00 mjweed2456

(s^3−2s−9)+(2s^2−6s^3+s) = s^4-6s^3+2s^2-2s

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(s^3−2s−9)+(2s^2−6s^3+s) = s^4-6s^3+2s^2-2s

What Am I getting Wrong Here?...
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