$x^3-6x$
$\sqrt{\left(2\right)^2-1}$
$8\cdot8\cdot8\cdot8\cdot8\cdot8$
$\frac{1000}{-8.9}$
$4x^2-5x-6$
$5a^2-90a+81$
$\left(3x^5+5\right)^5$
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