$\frac{3\left(x-3\right)^2\left(-x^2+6x+1\right)}{\left(x^2+1\right)^4}$
$logu=2$
$\left(9mn-5rx\right)^2$
$\frac{\left[\left(-9\right)-\left(+6\right)\right]}{\left(-5\right)}$
$x^5a+x^5b-a-b$
$55-x<25$
$-4-5+2-1$
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