$\left(5\right)\left(5^{x-2}\right)\left(5^{x+1}\right)$
$\int_0^{\infty}\left(2x+y\right)dx$
$24+68$
$\left(x+3\right)^2-\left(x-8\right)\left(x+8\right)$
$\frac{x^2+1}{x^2-1}$
$\left(x+1\right)\:\frac{x}{x+1}$
$-a+b+2b-2c+3a+2c-3d$
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