Calculate: 21op+21op^2-12op-21op^2

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  3. Calculate: 21op+21op^2-12op-21op^2

Expression: $21op+21o{p}^{2}-12op-21o{p}^{2}$

Since two opposites add up to $0$, remove them from the expression

$21op-12op$

Collect like terms

$9op$

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