$\left(-25\right).\left(-17\right).\left(+6\right)$
$12-2y+12+a$
$\frac{z^{-4}}{z^2}$
$\left(2a+3b-4c\right)^2$
$\frac{m^6\cdot m^4\cdot m^{-3}}{m^3\cdot m^2}$
$\frac{x^3}{3}-\frac{7x^2}{2}+6x$
$20n^{2}-9n-20$
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