$ax+bx+x$
$3m-7n+m-2n-4m+9n$
$11y\:+\:y$
$\frac{1}{3}^{-4}$
$a^3+\frac{b^3}{a}+b$
$81-\left(m+n\right)$
$80^2-40^2$
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