$3-\left(12-7\right)\left(-5\right)\left(2\right)+5$
$x^2-z^2+3x+2z+4=y$
$\lim_{x\to-2}\left(\frac{x^2-1}{x-1}\right)$
$7\left(2f\right)$
$\frac{d}{dx}\frac{x^2}{4}+\frac{y^2}{9}=1$
$3x^2+6x-9=0$
$2^{x+3}+2^x=72$
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