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OpenStudy (anonymous):
-9r^5-7r^3+8r^2+11 from 12r^5+9r^4-5r^2+3r+6
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mathslover (mathslover):
\[ 12r^5+9r^4-5r^2+3r+6-(-9r^5-7r^3+8r^2+11 )\] \[21r^5+9r^4-13r^2+3r-5\]
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