$\frac{\frac{21}{17}+3}{4}+\frac{\frac{21}{17}+6}{3}=2\left(\frac{21}{17}+1\right)$
$x+5\le0$
$5y^2-23y+12$
$\frac{4\cdot y^7}{2\cdot y^1}$
$\lim_{x\to\infty}\left(\frac{x-8}{x^2+8x+7}\right)$
$\left(320x^3-38x^2+80\right)-\left(84x-102\right)$
$a\:\:y\:a+b$
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