$g+g$
$\left(-5a^nb^m\right)\left(-9a^{n+2}b^{m-2}\right)$
$9x^2-40x+54=6x^2-22x+27$
$-2x^2+2x^2$
$54.\left(-4\right)$
$\frac{dy}{dx}\left(x^{\tan x}\right)$
$\left(-6t^2+3t-4\right)+\left(r^2+7t+5\right)$
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