$x-\sqrt{x+7}-5=0$
$30+29+28+27+26+25+25+25+24+23+22+22+21$
$\frac{x^2+11x+30}{x^2-4}\cdot\frac{x-2}{x^2+3x+40}$
$\ln\left(y^2\right)=.5\ln\left(x-1\right)$
$x+12^2$
$\frac{d^2}{dx^2}\left(2x^2\right)$
$x^4-6x^3+11x^2-6x$
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