$\frac{d}{dx}\sqrt{2-9x}$
$x-5<9-x$
$11.7=a+2.7$
$\left(2x-3\right)\left(2x+11\right)$
$\left(2d^2-3y\right)^2$
$m^3n^2+mn$
$4-2x>10-5x$
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