$x^2-4x+5\:+\:x^2\:-4x\:+\:5$
$\frac{a+b}{2}\:+\:\frac{\left|a-b\right|}{2}$
$\frac{m^4n^5o^6}{m^4n^2o^8}$
$\left(2x-1\right)^2-2x\left(x-3\right)$
$5d+3a+9d+5a$
$110d+20d-100d-d+10d$
$\frac{\left(x+a\right)^{-2}-x^{-2}}{a}$
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