$x2\:+\:26x$
$79\le2-r$
$0.5r+2.75r$
$4.25-\left(-8\right)$
$\frac{8x^3+6x^2+18x+1}{4x-1}$
$\lim_{x\to-6}\left(\frac{\left(t^3-4t+192\right)}{\left(t^2-t-42\right)}\right)$
$\lim_{x\to\frac{\pi}{2}}\left(\cos\left(-5x\right)\sec\left(-3x\right)\right)$
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