$1n\:+1\:-\:6$
$x^2\:-\:20x\:+\:x^2\:+\:3x\:$
$ab+bc+cd-8ab-3bc+5ab+2bc+2cd$
$\frac{-\frac{1}{x}+y\left(x\right)}{x}$
$x^3-9x^2+27-27$
$6e^{3x-1}-y=z$
$6x\:+\:1\:>13$
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