$-4-1-3+5-20$
$3x^2y-2xy^2+x^2y$
$\left(x^3-\:5x^2\:+\:x\right):\left(x^2\:-\:1\right)\:$
$\left(2a-5c\right)^2$
$\frac{dx}{dt}-2x=3t$
$\frac{0.5^{4n-1}}{4n-1}$
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