$\left|-5\right|+\left|-2\right|$
$\frac{54-6}{6}-2$
$\left(20-\sqrt{x}\right)^2$
$-8.1=3.1+\frac{y}{7}$
$\frac{1}{\sqrt{2}\pi}e^{\left(-x^2\frac{1}{2}\right)}$
$4\left(-2n-5\right)+9n$
$\int2x^4\left(2x^3-5x^4\right)dx$
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