$x^2+14x\le0$
$3.851+38$
$5m^2+15m^3+25mn$
$\left(\frac{2\sqrt[4]{x^3}}{\sqrt[3]{y}}\right)^3$
$40\cdot\left(-2\right)-4$
$\frac{a^3-3a^2-a+3}{a-2}$
$x+x^{-1}=2\:$
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