$-3-2-5+6+4+9$
$x^2-3x-15$
$\frac{x^2+12x+20}{x-10}$
$2a-13a+15=\left(2a-3\right)\left(a-5\right)$
$\lim_{x\to\infty}\left(\frac{8n+1}{8n-1}\right)^n$
$\left(16m^3n^3\right)\left(4m^2n^2\right)$
$3x^4x$
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