$-\left|2\right|+\left|5\right|+\left(-13\right)$
$\frac{2a^4b^2}{7a^3b^2}$
$\frac{dy}{dx}=-y^2-4y$
$\sqrt{3a^2}$
$15x^2+25x-9x-15$
$\lim_{x\to\infty}\left(-1+\frac{4}{x}\right)^4$
$\frac{\left(-8x+5x^2-12\right)}{x}$
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