$16+2x<40$
$\frac{d}{dx}\frac{3}{7}\sin^230$
$3a^2b=75$
$5m+xm$
$\left(x+3\right)\left(x-4\right)-\left(x-3\right)^2-5x$
$\frac{dk}{dt}\cdot x^2=\left[k^2+\left(40k\right)+1\right]\cdot x^2$
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