$\frac{3x^2}{x^5}$
$\lim_{x\to5}\left(x^2-x-20\:\:\right)$
$5y+5z+1b-7y-5z+3b$
$\int\left(\frac{1}{\sqrt{4-9t^2}}\right)dt$
$12-36-8+15-19-20-36+2-1$
$\int7x\left(\sqrt{6x^2+3}\right)dx$
$x^2+8x+y=z$
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