$\lim_{x\to-3}\left(\frac{4x^2-5x-21}{5x^2+15x}\right)$
$204=\:-6\left(5x-4\right)$
$a+\left(-b\right)=-7$
$\int_0^{\frac{4\pi}{3}}sec^3xdx$
$\log_x\left(\frac{1}{100}\right)=-2$
$9t^2-12t+4$
$\frac{d}{dx}3e^{4x+1}$
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