$-3x^2>-21x+30$
$2x^2+3xy-4x$
$\frac{-2}{x}+\frac{7}{\left(x-1\right)}$
$-2,36-2,5$
$30\:-\:\left(-2\right).\:\:10\:+\:\left(-5\right)\:.\:\left(-2\right)$
$4\left(-2g+9\right)$
$\sqrt{32}+\sqrt{8}$
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