$3x-5x+7x$
$\frac{6x^3+8x^2-48x+21}{3x-5}$
$-x^2+10x-9\ge0$
$\int\frac{9}{\sqrt{1-x^2}}dx$
$-5x\:-\:\left(-24\right)\:=\:\left(-21\right)$
$2x^2+7xy+3+3x^2+2xy+2$
$\frac{x^4+1x^2-4}{x^2+x+1}$
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