$$2\frac{8}{9}+5\frac{4}{9}$$

$$\frac{2x^5-10^3-2x^2-10}{x^2-5}$$

$$2sin^2\left(x\right)-19\left(sin\left(x\right)+9\right)=0$$

$$\left(4x^{\frac{1}{3}}y^5+8x^4y^{\frac{2}{3}}\right)\left(4x^{\frac{1}{3}}y^5-8x^4y^{\frac{2}{3}}\right)$$

$$8x^5+x^4+2+4x^5-2x^4+x$$

$$5\left(k+7\right)$$