$\frac{3}{x+4}+\frac{2}{x+1}$
$\left(\frac{5x}{7}-\frac{y}{2}\right)$
$\left(7x-5y\right)\left(7x-5y\right)$
$x^2y^2+x^2+y^2=1$
$2\left(7z\right)$
$\left(8-\left(-2\right)\right)+9$
$\frac{2\left(\frac{1}{2}\right)+6\left(\frac{1}{3}\right)}{3}$
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