$$\int\frac{6x^2-x+1}{x^3-x^2}dx$$

$$-\left(-13\right)-5\left(7\right)$$

$$3x^2-2xy^2$$

$$\:\frac{x^3-8x+5}{x+3}$$

$$\left(+24\right):\left(-10-+2\right)$$

$$\frac{3x-2}{2x^2+4x-6}$$

$$\frac{x}{x-1}+\frac{2x}{x+1}=3$$