$\sqrt[7]{20x^{3}}-2x\sqrt{45x}-\sqrt{45xy^{2}}$
$\left(5x^3+3y\right)\left(5x^3+9y\right)$
$y^2-3y-18$
$\left(u+v\right)^2-18\left(u+v\right)+65$
$\frac{9x^3}{4}.\frac{9}{2x^4}$
$4x^3-13x^2+4x-3$
$\left(-15\right)\left(30\right)\left(-8\right)\left(-7\right)$
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