$\frac{x}{x+1};\:x=1$
$4-\left[7-\left(-2\right)\right]$
$6r+\frac{3}{4}s\:,\:r=-2,s=4$
$12x^2-20x+5\le0$
$4x-3x-2x$
$\frac{21u^7}{3u^4}$
$4d^8\cdot2d^{-6}$
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