$\left(2a-b\right)+\left(5a+b\right)$
$p^2-49$
$8v^3\cdot4vu^2$
$3a-6b$
$\frac{4x^2-121}{2x-11}$
$\frac{dy}{dx}=\frac{3y^2+4x^2}{xy}$
$\frac{4.1889}{10}$
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