$x^2-24x+135$
$x^2-18\le0$
$6x\:+\:7y\:-\:2x$
$52-19.2$
$\frac{125-343x^{15}}{5-7}$
$\left(2x^2y^4-3x^2y\right)^2$
$3\sqrt{8a}-5\sqrt{29}+2\sqrt{32a}-\sqrt{128a}$
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