$-11b+7=40$
$-9m\:-\:6\left(m\:+\:6\right)$
$\frac{9y^7}{y^{-4}}$
$\sqrt{\frac{m}{n}}$
$12a+24$
$\frac{d^2}{dy^2}\left(x^2+3xy+2y^2\right)$
$-x^2-3x+40$
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