$\frac{x+5}{\left(x+4\right)\left(x-1\right)}$
$y^{'\:}+\frac{2y}{x}=3e^x$
$\lim_{x\to1}\left(\ln\left(x^2\right)\right)^{x-1}$
$x+z-2y\left(2z+y+3x\right)$
$x^2-6x+34$
$x^3-2x^2+1$
$\left(7ab\right)^2$
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