$7+x=-4$
$\int\frac{x}{\sqrt{\left(x^2+4\right)^5}}dx$
$\frac{-8x^5+3x}{x-2}$
$\frac{125+x^6}{5+x^2}$
$m^4+5m^2+225$
$1+7+19+13$
$7-\left(11-8+6\right)-\left[10-\left(7-2+1\right)-2\right]$
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