$\frac{x}{2}-3\ge-7$
$\left(-\sqrt{x-1}+5\right)^2$
$f\left(x\right)=\frac{\left(2x+1\right)\left(x-5\right)}{3x+2}$
$-3x>9$
$5x\:\cdot\:-5x$
$\frac{x-5}{4}>5$
$\frac{dy}{dx}-y\cdot cotg\left(x\right)=0$
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