$2\left(a+2b\right)-a-2b$
$-736+-42$
$\left(xy+y\right)dx-\left(xy+2x\right)dy$
$\frac{\left(-1\right)^{k+1}}{k}$
$\sqrt[3]{\frac{x^3y^6}{z^9}}$
$7x^2+54x-16$
$\frac{1-x}{-2\:}<2x$
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