$\left(3p+5q\right)\left(3p-5q\right)$
$\frac{x^4}{x^{-2}}$
$10-\left(-8-2\right)$
$5x^2-12x+9$
$5x^2-30x-35$
$mn\sqrt{8a^4}b^3$
$\frac{4x^2+36}{x-3}$
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