$\left(-2n+3\right)\left(-2n-3\right)=4n^2$
$\frac{x^{-2}}{1-2.5x^{-1}+2x^{-2}-0.5x^{-3}}$
$\left(\frac{4}{x}\right)-3>\left(\frac{2}{x}\right)-7$
$-40+18-\left(2-8\right)+\left(-4\right)$
$\int\left(f+4\right)^5df$
$\left(x+9\right)\left(3x-9\right)$
$57,2+3,768$
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