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$\left(x+7\right)\left(x-3\right)-x^2+21$

Final answer to the exercise

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Other solved exercises

$1+\frac{2}{3p}+\frac{p^2}{9}$

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$\left(9x^2y-7xy^2\right)^2$

$40^2$

$\left(t^2+5\right)\left(t^2\:+9\right)$

$-7b+7b$
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