$\frac{45}{10a-10}$
$\lim_{t\to5}\left(\frac{\left(1-t\right)\left(t+5\right)}{3t-7}\right)$
$x^{-2}$
$-2x^3+5x^2-3$
$6x+25-2x+3$
$8\left(2\right)\left(3\right)\frac{3}{2}$
$640-10x^2$
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