$4z^2-16z=36$
$2^0\cdot2^2$
$\:x^3+6x^2+12x$
$\frac{\left(6x^2y-12x^3y^2+9y^3\right)}{-3xy^2}$
$2x+y+3z=0$
$y^2=81$
$2\left(-21\right)$
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