$2x^3-6x^2+8$
$1+\frac{y}{5}+\frac{y^2}{100}$
$27y^2+18y+3$
$10a^{2}-5a+15a^{3}$
$-4+\left(-6-7\right)-\left(-2-\left(-5+9\right)-3\right)$
$-4x^2+\:6x+5$
$\left(\left(3y^{-2}z^4\right)^4\right)^{-1}$
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