$\left(-7\right)+\left(-7\right)+\left(-7\right)+\left(-7\right)+\left(-7\right)+\left(-7\right)$
$\left(9x-7\right)\left(2x-5\right)$
$\sqrt{ax^2}$
$\left(3x^{\frac{1}{5}}\left(\sqrt{x}+\sqrt{y}\right)\right)^{-1}$
$x^2+4x-1=0$
$\left(0.5n^2m+11\right)\left(0.5n^2m-6\right)$
$121\:-264z\:-144z^2$
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