$\:+2\:-\:3\:+\:9\:-\:7\:-\:5$
$1-\frac{u}{u-1}$
$-6561-2187$
$28x^2+23x-15$
$x+1=\sqrt{x+3}$
$\left(2x^2+1\right).\left(e^{2x}\right)$
$\left(x-\:5y\right)^2$
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