Division \[ 21 c^{3}-5 c^{2} d-3 c d^{2}-2 d^{3} \text { by } 7 c^{2}+3 c d+d^{2} \text {. } \]
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Division
\[
21 c^{3}-5 c^{2} d-3 c d^{2}-2 d^{3} \text { by } 7 c^{2}+3 c d+d^{2} \text {. }
\]
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