Evaluate
21-6r-3r^{2}-30y
Factor
3\left(7-2r-r^{2}-10y\right)
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-30y+21-3r^{2}-6r
Add 12 and 9 to get 21.
3\left(-10y+7-r^{2}-2r\right)
Factor out 3.
Examples
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Matrix
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Simultaneous equation
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Limits
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