$9m+m+7m$
$\lim_{x\to4}\left(\frac{c^2-16}{c-4}\right)$
$10x\:-20=30$
$-4\left(-6w+6\right)-w$
$\lim_{x\to\infty}\left(x^7+2x^3+2x^2\right)$
$\frac{5x^2+4x}{2x+5}$
$\frac{\left(cos\left(x-y\right)+cos\left(x+y\right)\right)}{cosx}$
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