$\left(3-20x\right)^2\left(4-30x\right)^2$
$-k^3+6k^2-12k+8$
$\left(x-y\right)dy+ydx=0$
$\left(13\right)\left(-2\right)\left(-7\right)$
$4+2+6-12$
$\frac{x-1}{x^2-x-12}$
$500-92$
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