$13x-7y+4x$
$\frac{\frac{m^2}{s^2}}{m}$
$x^2-20x-44$
$a^2+a-20$
$9a-3a+5a$
$\left(3a^2\right)\left(4x+y\right)$
$\int\:e^{6x+1}dx$
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