$\lim_{x\to\infty}\left(\frac{ln3x}{e^7x}\right)$
$\log_{\frac{1}{2}}\left(x+3\right)=-4$
$3a-\:4b\:+\:5b$
$y^2-y-72$
$\frac{1}{3}\int\frac{1}{\frac{-17}{2}+\left(x-2\right)^2}dx$
$\frac{2x}{\sqrt{2+4x}}$
$2x^4-4x$
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