$15+2w-w^2$
$x^2-3x+5=0$
$\frac{16v^{-13}w^4+32v^{-2}w^5}{8vw}$
$-n+8n$
$3^6\cdot3^2$
$\left(2^7\right)^5$
$\frac{x}{3}e^{3x}$
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