$y^2-4y+4$
$\left(3m\:-\:4n^3\:+\:t^4z^2\right)^2$
$1x^2yz+3xy^2z-2xyz^2-3xy^2z+1xyz^2-1x^2yz$
$8x^2y+4xy^2-5x^2y-6x^2y+3x^2y-6xy^2$
$a^7xa^{-2}$
$5x^2=125$
$\:3m^2,-4m^2,7m^2,2m^2$
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