$$2\:-\:5\:\left(3\:-\:x\right)\:=\:7x\:-\:9$$

$$\lim_{x\to0}\frac{7^{sinx}-1}{5x}$$

$$\left(x+\frac{1}{10}x^{10}\right).\left(x-\frac{1}{10}x^{10}\right)$$

$$\frac{5}{2}^{-2}$$

$$\lim_{x\to0}\left(\frac{e^x-e^{-x}}{\sin\left(x\right)+x}\right)$$

$$\left(g-5\right)x\left(g-7\right)$$

$$\int-6x^29^{4x^3}dx$$