$16x^2-9y^4$
$\left(3xy\right)^3$
$\left(\frac{18x^3y^4}{3xy^2}\right)$
$25x^2-10x+4$
$-15\cdot5$
$\left(-x-h+2\right)^2$
$\frac{4x^3+20x^2+9x-28}{x+4}$
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