$-2\left(-9\right)$
$-3x^6\left(-4x^2\right)$
$7x^3+10x^2$
$x-4x+5x^2-4x^2$
$\left(3x^2y-2z^4\right)^3$
$\frac{d}{dx}\sin\left(x+y\right)=3y+4x$
$9^2+30n+25$
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