$-5\left(10\right)^2-6\left(10\right)-8$
$13x+25\le298$
$-27.30-23.5+12.3$
$x^7-4x^6$
$\frac{2\cos\left(x\right)}{\cos^2\left(x\right)-1}$
$-2\left(xy^2+\frac{1}{6}x^3y\right)$
$\left(z+m\right)^7$
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