$1+216x^9$
$\frac{x^2+4x-8}{x^2-1}$
$\frac{t}{1+t^3}$
$-x^2+6x-8=0$
$\frac{1}{9}\:x^2\:-\:12$
$20-2.\left[10-3.\left(6-9\right)\right]$
$4\cdot2^3-3\cdot2^2-2+5$
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