$4m^2y^3-4m^2$
$121-z^{12}$
$x^2\:+\:10xy\:+\:25y^2$
$\left(x^3-4y\right)\left(x^3-2y\right)$
$-4-15\cdot15$
$8a-\left|4b-11c+2-\left(3b+2c-7\right)+3a\right|$
$-x^2-6x+9$
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