$2^{x+1}+2^{2x}=8$

$\lim_{x\to+\infty}\left(\frac{3}{7}\right)x$

$\lim_{n\to\infty}\sqrt[3]{n}-\sqrt[3]{n-1}$

$24=-24x$

$\left(\frac{4}{3}x^2y^2-\frac{1}{2}x^3y^4\right)\left(\frac{4}{3}x^2y^2+\frac{1}{2}x^3y^4\right)$

$3\sin\left(2x\right)\cos\left(x\right)-2\sin\left(2x\right)=0$

$2x^2-5x+21=0$