$-2\left(3c+5d\right)$
$\frac{dy}{dx}=\frac{1}{\cos\left(y\right)}$
$\frac{3x^4-5x^3-20x-15}{x^2+x+3}$
$-3000+1000$
$\left(z+1\right)^2$
$\frac{35}{7}\cdot7$
$x^2+6x-6=10$
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