$\left(9m-1\right)\left(9m+1\right)$
$12+36+15x-3-6x\left(-9\right)$
$-\left\{-\left(-4\right)-\left(-7\right)\right\}$
$\frac{6x^2+8x-2}{x+3}$
$\frac{d}{du}x^3\sqrt{x^3+4}$
$3x^2-2x-1$
$11a-8a-2a-3a+5a$
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