$6a-12m^2+4n+8m+n^2+n$
$\lim_{x\to4}\left(\frac{10x^2+50x}{x^2-25}\right)$
$-8x-30=-12x-58$
$\left(a^7b^2\right)\left(a^4b^9\right)^3$
$\lim_{x\to\infty}\left(\frac{5x\:+\:e^x}{3x^2\:-2}\right)$
$a+a+3b+b$
$10s^2+5s+10$
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