$\left(3x\:-\:2y^2\right)^3$

$7a+5c+4c$

$\lim_{n\to\infty}\left(\frac{x^3+x^2+x}{x^3-1}\right)$

$\lim\:_{x\to\:\:a}\left(\frac{cos\left(x\right)\cdot\:\:in\left(x\right)-a}{in\left(e^x-e^a\right)}\right)$

$\left(x^3-a^3\right)\left(x-a\right)$

$+8+4-6-9+14-12+15-49$

$3^{\left(x+1\right)}\cdot27^{\left(x+3\right)}=9^{\left(3x+4\right)}$