$z^2-5z+6$
$2^{\frac{1}{8}+\frac{7}{8}}$
$x^4-6x^2+9$
$35-3\cdot8$
$7+025+8+3+2$
$6x-x+2z-3z+2x+z$
$\left(+500\right)-\left(-189\right)$
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