$81x^2-9x+25$
$\frac{-2x^5+8x^4+2x^2}{-2x^3}$
$x^2-40x$
$\left(6x^2+12x+6\right)$
$\left(8\right)-\left(+1-6\right)$
$\sqrt[2]{1-\left(-1^3\right)}$
$x^2-23x+120=0$
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