$\left(n+3x\right)\left(n-3x\right)$
$\frac{d^2}{dx^2}xe^{5x}$
$\left(4x^2+5y\right)\left(4x^2-5y\right)$
$a^3b-3ab+2b$
$x^2-2xy^3=x-3$
$\frac{-2x^2}{x+5}$
$10z-4y+x-2z+16x+4y$
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