$-\frac{8hx-4h^2-h+1}{h}$
$a.\:30\:-\:20\::\:5\:+\:15$
$\log_b\left(x^2y^2z\right)$
$\sqrt{\frac{2.1}{1.8}}$
$x-5+3x-4$
$\left(\frac{n}{n+1}\right)\cdot\left(-2x\right)^{n-1}$
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