$21\:+\:10\:+\:1$
$-2=\frac{a\left(-2\right)+b}{\left(-2\right)+c}$
$-124x^3+116x^4$
$\ln\left(x+7\right)=\ln\left(x-9\right)-\ln\left(x+9\right)$
$x\left(x-3\right)=0$
$\frac{d}{dx}\:\frac{7x-5}{3x^2+1}$
$2x+10>5x-4$
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