$24-3\left(2-4^2\right)$
$72abc^2-3abc^2+13xyz$
$\frac{1+\sec\left(a\right)}{\frac{1}{\cos^2\left(a\right)}+\sec\left(a\right)}$
$4x-9=-29$
$1+3x-8$
$3sinx=sinx+1$
$\lim\:_{x\to\:0}\left(\frac{3x^2-6x}{2e^x-2x-2}\right)$
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