$18a^2\:-61ab-8a^2+210-51ab-31+a^3-3ab$
$x+4-5x-2$
$f\left(x\right)=1+\frac{1}{x}$
$\int\frac{x^2-1}{x^3+64}dx$
$\frac{2}{x+3}-\frac{1}{x^2+7x+12}$
$1+-100$
$4x^2-16+64$
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