$36-\left(-78\right)$
$\left(1+\sqrt{5}x\right)\left(1-\sqrt{5}x\right)$
$x^{6-27}$
$\left(3\:^{-4}\:\right)\:^6$
$\lim_{x\to9}\:\frac{\sqrt{x-3}}{x^2-81}$
$1-18f-81f^2$
$\left(-5x\right)\cdot\left(3x-2\right)$
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