$3r+r$
$\left(+\frac{1}{3}mn\right)\cdot\left(-mn\right)$
$\left(6-2g\right)^2$
$\frac{3}{8}a-0.2a$
$\left(9y\:-1\right)\left(9y\:+\:2\right)$
$5^{25^0}$
$\sqrt[3]{\frac{12bc^4}{a^2c}}$
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