$\lim_{x\to\infty}\left(\frac{e^x}{9^x}\right)+\left(\frac{\left(-4\right)}{9}\right)^x$

$25\cdot\sin\left(x\right)-12=0$

$\lim_{x\to\infty}\:\frac{2^{2x}\cdot2}{4^x-1}$

$4x\:-3y\:+\:4z\:+\:-7x\:+\:y\:-\:6z$

$4x^2-8x-32=0$

$\frac{3^2}{3}$

$\left(a^2b^4\right)^2\left(-c^5d^3\right)^2$