$$\left(-4\::\:2\right)\:+\left(-1+1\right)$$

$$y'=\frac{1}{3}x\left(y-20\right)y$$

$$2x-10<4x-24$$

$$-5x^2+7x^2-3y^2-x^2$$

$$\int x\cdot\cos\left(4x-3\right)dx$$

$$2x^2-3x+xy=5$$

$$\int\left(\frac{5x+2}{5x^2+4}\right)dx$$