$\:9a^2-12xy+9y^2$
$2x^2+7y-7=0$
$3\sqrt{x}+5\sqrt{y}+2+\sqrt{x}+\sqrt[3]{y}-4$
$\left(x^2-a\right)^3$
$\frac{z^2-18z}{z}$
$8x^2\:-9=0\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$20r^2-45r$
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