$\int\left(\frac{x+1}{x^2+4x+3}\:\right)dx$
$3a-4a+5a-7a+12a$
$\int_{2x}^{3x}\frac{\sin\left(t\right)}{t}dx$
$\:63x\:+\:35y$
$285-200-025-305$
$\frac{x^2+x^{-2}}{x^3+x^{-3}}$
$\frac{4x^2-1}{2x-1}$
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