$2x<0.3$
$20x^2-x=0$
$-\left(123+13\right)-145+145$
$2\left(-2\right)^4-2\left(-2\right)^3+3\left(-2\right)^2+5\left(-2\right)+10$
$-x-2\ge-4$
$\frac{d^2u}{dt^2}+\frac{du}{dt}=6u+5e^{2t}$
$\left(x-8\right)\left(-8-x\right)$
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