$\frac{3^6-729}{x-3}$
$2x^2-3=5$
$12mn+8n-3n-2$
$\left(+19\right)-\left(-4\right)$
$\left(3x-4\right)\left(3x+8\right)$
$3x\:=\:30\:+\:x$
$\frac{\left(x+2\right)}{2x^2+5x+3}$
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