$4x^2+12+9$
$\left(12.6+0.3\infty\right)+-0.4$
$w^4+7w^2+16$
$\left(-5\right)-\left(-31\right)$
$y\:x\:+\:2\:=\:0$
$\frac{\left(z^2-3z^3+27-4z+4\right)}{z-1}$
$\frac{x^4-x+1}{x+2}$
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