$$-10x-x^2+6x^2+18x-x^2+3x+2x^2+10x$$

$$\sqrt{36x^6}$$

$$2x^3+2x^2-3x+2$$

$$\frac{3^3}{3^4}x\:3^5$$

$$30\:-\:20\::\:\left(5\:+\:15\right)$$

$$3-5\left(5n-3\right)$$

$$\int\frac{\left(5-50x\right)}{\sqrt{9-25x^2}}dx$$