$2\left(4r+10\right)+3r\:=\:152$
$8+2n$
$\left(5c^2+7d\right)^3$
$8x-3\left(2x-1\right)=3x+1$
$2x^2+26+9$
$\lim_{x\to\infty}\left(\frac{1}{x}\right)^x$
$\frac{3x^4-5x^2+8}{2x^3-5x^2}$
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