$\frac{x^2-14x-51}{x^2-4x-21}$
$\left(5m^2-n^3\right)\left(5m^2+n^3\right)$
$500\cdot025$
$t^3-t^2-4t+4$
$6b=54$
$\int2x\left(7-e^{\frac{x^2}{4}}\right)dx$
$\frac{8}{x}=\sqrt{\frac{64}{x^2}}$
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