$\lim_{x\to0}\left(\frac{\sqrt{1+8x}-\sqrt{1-2x}}{x}\right)$

$\log\left(3x+8\right)-\log\left(x\right)=\log\left(x+5\right)$

$\lim_{x\to\infty}\left(\frac{\frac{\pi}{2}-arctan\left(x\right)}{e^{-x}}\right)$

$10m^6-5m^7+10m^4$

$20-17-3\left(60-70\right)-2\left(-17\right)$

$\:8\:x\:-\:12\:y\:+\:32$

$\left(x-7\right)^2\left(x+7\right)$