$48c+23c-50c$
$\frac{\frac{33}{5}}{9}-\frac{2}{5}=\frac{1}{3}$
$x^4+29x^2+225$
$\left(5y\:-\:4\right)^2$
$107\cdot6$
$ab-ab+7ab+4ab-2ab$
$x^{2\:}-\:5x=\:14$
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