$\lim_{x\to\infty}\left(\frac{15^x-4^x}{x}\right)$
$\int\:60\:dx$
$\left(\:6a+b\right)^2$
$\left(-\frac{2}{9}x-2\right)\left(-2x+\frac{2}{9}\right)$
$-126\::\:9$
$5a^2-6a+7a^2+3a+8a$
$3n-8+n$
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