$12,35\:-37$
$9r^2-4r+1$
$\left(x-y^3\right)^3$
$\frac{y^{15}-z^{15}}{y^3\:z^3}$
$\left(-6\right)^2+-6$
$\left(7a^2b+5x^4\right)^2$
$8x^{15}y^{21}+1000$
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