$\left(-2-y\right)\left(-9-y\right)$
$-13xy^2\left(-6xy\right)$
$\lim_{x\to0}\frac{\sin\left(0\right)}{0}$
$49\cdot7$
$16-\left(-25-3\right)$
$\frac{3^{17}}{3^{13}}$
$-4x\left(2x-1\right)-9x\left(2x-3\right)$
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