$4+x-2x+3x-2+5x$
$\frac{20}{9}m^5-\frac{5}{2}m^3$
$1+\sqrt{16}$
$m^2+2m-36$
$\left(5+b\right)^3$
$\frac{\left(2a^{5\:}b^2\right)}{5a^7b^{-3}}3$
$3x^2+6x-45$
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