$\frac{89.3}{120}$
$-4a\:-\:2b\:+\:3b$
$-4\left(2\right)\left(-27\right)$
$\left(\frac{6k}{j-2}\right)^3$
$\frac{7^{-4}}{7^{-9}}$
$2xy'-y=x^3-x$
$x\frac{dy}{dx}=f+1$
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