$$\frac{y}{2}+9=6$$

$$\int x^7e^{-x}dx$$

$$-2\ln\left(3y-1\right)=-4x-2\ln\left(3\right)$$

$$3\log\left(x^2y\right)-3\log\left(xy^2\right)$$

$$\int\left(\frac{2x}{e^{3x}}+\frac{7}{e^{3x}}\right)dx$$

$$z^2-6z+5$$

$$x^2-2x+4\le0$$