$-24+18-6+35-57+2$

$\int\frac{21x-15}{x^2-x-2}dx$

$\left(\sqrt{2}x+3\right)\left(\sqrt{2}-3\right)$

$x2-7x+24$

$\lim_{x\to0}\left(1-6x\right)^{\frac{6}{x}}$

$\frac{d}{dx}\left(2x-e^{8x}\right)^{\sin\left(2\right)}$

$\left(14a^3-7b^2+12\right)-\left(5a^3-4b^2+2\right)$