$\left(5x^2-4\right)\left(5x^2+3\right)$
$x^2+\left(-a-b\right)x+1$
$x^3\frac{dy}{dx}+3x^3y=e^x$
$-30\:+18-\left(-7\right)+1-5-\left(-6\right)+\left(-7\right)$
$\frac{7}{4}\left(4\right)$
$x-4=19$
$-45\left(-29\right)$
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