$5x-27=-x^2$

$\lim_{x\to0}\left(\frac{4\left(1-\cos\left(x\right)\right)-2x^2}{x^2}\right)$

$2x+1\:+\:2x-1$

$\frac{3x^3+8x^2-7x+4}{x-1}$

$-91\:-\:\left(-68\right)$

$\int\left(\left(4x^3+3x^2\right)e^{x^4+x^3}\right)dx$

$\int\left(x\cdot\left(x^2+7\right)^9\right)dx$