$-20x^2+600x-4000$
$12\:a\:2\:+\:8\:a\:+\:5\:a\:2\:-\:7a\:-\:5\:a\:2\:+\:9\:a\:+\:7\:a\:2\:-\:5a$
$10+5y+6-4y-7$
$3xy-7x-12y+28$
$6\left(-1\right)^2+4$
$\left(40+5\right)\cdot3$
$\frac{dy}{dx}+6xy=30x$
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