For this case we have the following equation: (3x + 4) ^ 2-36 = 15x + 20 We can rewrite the equation: (3x + 4) ^ 2-36 = 5 (3x + 4) Now we define the following variable: p = 3x + 4 Substituting the variable in the equation we have: p ^ 2-36 = 5p Rewriting: p ^ 2 - 5p - 36 = 0 Answer: An equation that is equivalent in terms of p is: p ^ 2 - 5p - 36 = 0