$25z^3-2z^2-4z^3+8z^2-9+z$
$\left(4.3\right)^9:\left(4.3\right)^6$
$x^2y^4+2x^3y^2+x^4z^2$
$\left(2y-3y\right)$
$-133+1000$
$-9\:+\:7\:-\:-43$
$\left(2x+\left|-5-\left(x-y\right)\right|\right)-\left(12x^2-6xy+24y^2\right)$
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