$\frac{5}{x^2-4x-45}$
$\frac{\left(\frac{1}{x+3}\right)-\left(\frac{1}{3}\right)}{x}$
$\frac{64n^{27}-1}{4n^9+1}$
$36a^2+48ab+16b^2$
$adb-b^2da=0$
$2x+y=31,5$
$-51\:+-84$
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