$\left(6a-3b\right)\left(a+b\right)+\left(6a-3b\right)\left(5a+10b\right)$

$\frac{2x-1}{5}-\frac{x}{4}=1$

$\int\left(\frac{\left(4x-5\right)}{x^2}\right)dx$

$\frac{3x^6}{4x^2}$

$\lim_{x\to\left(0\right)}\left(\frac{e^{2x}-1}{sin\left(x\right)}\right)$

$\lim_{x\to\infty}\left(\frac{6x^9+12x-3}{8x-3x^9+2}\right)$