$$2x-3y-z+2w+3v=4$$

$$\left(16x^2-6x^3+5x\right)+\left(-4+16x^2-31x^3\right)$$

$$\sqrt{ax}$$

$$\frac{1+tan^2x}{cscx\:secx}=tanx$$

$$\left(2a+6\right)\left(x-6\right)$$

$$\frac{0,1x+x^2}{x^2-0,7x+0,12}$$