$r^2+12r+36$
$\frac{4x^2+23x+33}{x+4}$
$\frac{\left(3^{2}\cdot11^{-1}\cdot13\right)^{-k}}{3^{5}}$
$65=-4b-9b$
$xdx+e^{3x}dy=0$
$9^2.\:9^1$
$\left(4^6\cdot4^4\cdot4^2\right)$
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