$\left(x^2+xy+y^2\right)\left(a-b\right)$
$\:5a+7a+4^a$
$\lim_{x\to0}\left(e^{\ln\left(x\right)+\cos\left(x\right)}\right)$
$\frac{5}{2}x+\frac{1}{2}\left(\frac{1}{5}x-\frac{3}{4}\right)\leq\frac{3}{8}-\frac{3}{2}\left(\frac{1}{3}-x\right)$
$\frac{6}{x^2}-\frac{9}{x}=-\frac{4}{3}$
$-1.5+2$
$3\left(5-a\right)$
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