$\frac{a^{-5}b^2}{ab-4}$
$\left(2\frac{1}{3}\right)^{-2}$
$5\left(3\:-18\:15\:-1\:5\right)$
$\lim_{x\to3}\left(\frac{\sqrt{x+1}-3}{x-3}\right)$
$3a+18-12a+15a$
$\left(12y-10x\right)\left(12y+10x\right)$
$3xyz\left(-5x^2y^3z^4\right)\left(-10xy^2z^3\right)$
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