$\frac{3}{4xy}-\frac{5}{4xy}$
$3\cdot3^4$
$-4\:+\:5n\:-7n\:+\:8$
$\left(4w+2\right)\left(4w+5\right)$
$\int e^{-0.06t}dx$
$x^2+8x-1=0$
$\frac{-6^8}{-6^5}$
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