$$\frac{dx}{dt}=-5x+3$$

$$\left(x+7y\right)^2$$

$$\int_0^4\left(\frac{1}{x^2-x+6}\right)dx$$

$$\left(\frac{1}{2}x^2+\frac{1}{3}xy+\frac{1}{4}y^2\right)$$

$$x^2+4x+4=9$$

$$\left(-5+6-2+1\right)-\left(-12+2+3-9\right)$$

$$xy+5xz$$