$\frac{\left(x^2y^3\right)^3\left(xy^4\right)^{-3}}{x^2y}$
$2\left(2x+9\right)$
$-2\left(-6\right)^2$
$4y^2-81$
$-9c+2c+2d$
$4x^2-5x+10\:\:\:\:\:$
$12.405\:-\:8.75$
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