$3z^2+z-2$
$3y+4x^{2}-3x^{2}-2y+x^{2}+2y-3x^{3}$
$x^3y^2x^{-1}$
$100m^2+49n^2-140mn$
$144a^2-120a+25$
$5p+3p+\left(-9\right)$
$-8x^2+3x-7=0$
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