$\frac{2}{x^2-1}-\frac{1}{x-1}=\frac{1}{2}$
$\left(x^{\frac{2}{3}}\right)^{14}$
$340\cdot340+160\cdot160$
$81a^{6}b^{4}-36c^{4}d^{6}$
$\left(5mn-3n\right)\left(5mn+3n\right)$
$-\:9t^2+5t-4t$
$12a^2-3a-21a^3$
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