$$-12a+4-10a$$

$$\int\frac{7x+4}{x^2+7x+6}dx$$

$$x\cdot x\cdot x\cdot x\cdot x\cdot x+4x\cdot4x\cdot4x+4$$

$$\left(2x^3+5x^2-3x+1\right)\cdot\left(2x^2-3\right)$$

$$\frac{16.750}{12500}$$

$$3x^2-7x+6=0$$

$$x\left(2x^2+y^2\right)\:$$