Solve the system of equations 4) 8x + 20 = 10 + 2(3x + 2).

To solve this equation, expand the parentheses: 8x + 20 = 10 + 6x + 4. Simplify and solve for x: 8x - 6x = 10 + 4 - 20, resulting in x = -3. The solution is x = -3.