$-5\left(18-21\right)^2$
$\int_0^{\infty}\left(kxe^{b-ax}\right)dx$
$\frac{d}{dx}\frac{x^3+\sqrt{x}}{x^3}$
$s^2+13s+22$
$10x^2-13x-14$
$2x^2+30x+122=0$
$-60.15\:-\:\left(20\right).10$
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