$\frac{3x^2+2x}{x+1}$
$20+4k$
$2\cdot\left(x+8\right)<7\cdot\left(x+8\right)$
$\left(\frac{x}{2}\right)^2$
$6a=78$
$\int\:xe^{71x}dx$
$-4+2y=12$
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