$+3n+2mn$
$4\cdot4\cdot4^{-5}$
$-\frac{27}{3}+15$
$5x-4y-2x-3+5y-1$
$\frac{x^2+x}{2}\cdot\frac{1+x^2}{2}$
$\frac{x^33x^2-4x+12}{x+1}$
$\left(13-2xz\right)^2$
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