$7x\le56$
$\left(\frac{x}{8}\right)^3$
$\frac{3x^2+5x-4}{x}$
$\frac{dy}{dx}=y^2+2y-15$
$\lim_{x\to\frac{\pi}{2}}\left(2cos\left(-7x\right)sec\left(9x\right)\right)$
$3x^2+6x+4$
$\left(-8\right)\left(-2\right)$
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