$\frac{1}{\left(n^3-n\right)}$
$\frac{11x}{\:15x}+\frac{3x}{10^3}$
$f\left(x\right)=x^2+2x-8$
$\left(0.7\right)\left(0.7\right)$
$3x-60=180$
$a^2\left(-b-2c+a\right)$
$2x^2\le8$
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