$15=12+\log x$
$\lim_{x\to\infty}\left(1+\frac{2}{x^3}\right)^x$
$\left(-1\right)^{17}.\left(-2\right)^5$
$24x+15y=300$
$3x^2y-7x^2$
$\left(4x-2\right)\left(4x-1\right)$
$\left(x\:+\:3\right)\left(x\:-\:3\right)$
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