$x^2-6x-1;\:x=3$
$x+5-x^2-2x+15$
$\lim_{x\to0}\left(\frac{sin\left(x\right)}{1+8x}\right)$
$\frac{x-1}{x-3}+\frac{x-4}{x-5}$
$\left(15x-12\right)\left(15x+8\right)$
$3\left(8c^4\right)^2$
$\frac{\left(2a^2mx^2y\right)+\left(6a^2nyz^2\right)}{2a^2y}$
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