$9-\left(-3r\right)$

$\frac{1}{2}+\frac{15}{2x-7}-\frac{3x-5}{x^2-7x}\:$

$256y^2-1200y$

$-24-7a>-6+3\left(4-4a\right)$

$\frac{d}{dx}\left(\left(ln\left(x\right)\right)^{\left(3sec\left(x\right)\right)}\right)$

$-2\left(-1\right)^5-3\left(-1\right)^3+2\left(-1\right)+1$

$\left(3ar^2+a\right)^3$