$\frac{\left(2x-1\right)}{1+2x}>3$
$-1\:+\:14\:+\:-5\:+\:4$
$-\left(1-2x\right)^2$
$-12x-17=-89$
$5+\left[-5+10-\left\{2-9+\left(-8+2\right)\right\}\right]-6+7$
$3x^2+y+2y^2+4y^2$
$\frac{2x^2}{x^2+4}$
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