$\lim_{x\to0}\left(\frac{x-1}{1-cos\left(\pi x\right)}\right)$
$\frac{6x}{7x+3}<7$
$6a^3b^2-18a^2b^2+24a^2b^3$
$\int\frac{1}{\left(9+25x^2\right)^{\frac{3}{2}}}dx$
$3^{9z}=3^{7z+8}$
$5m+3m-6m-m$
$x\:+18=11$
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