$\frac{x}{x+3}+\frac{x}{3}$

$\lim_{x\to\infty}\left(\frac{\ln\left(6x+9\right)}{\ln\left(8x+6\right)+3}\right)$

$\frac{\cot\left(x\right)}{sec\left(-x\right)}+\frac{tan\left(x\right)}{sec\left(-x\right)}$

$\left(5a^{\frac{2}{3}}\right)\left(4a^{\frac{3}{2}}\right)$

$5\left(3n\right)$

$\left(-8\right)\cdot12-56$

$\frac{3}{4}x^2-\frac{1}{6}x^2+2x^2-\frac{5}{12}x^2+\frac{4}{5}x^2$