$-2+\frac{9}{3}$
$\:5a+7a+4^a$
$x+7\ge3-5x$
$\frac{3x-6}{2x-2}\ge3$
$14,7+10,5+2,1$
$\frac{2x^2-x-1}{x}$
$\left(4x-6\right)\left(3x-5\right)$
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