To solve for p in the equation 3(p + q) = p, we need to isolate p on one side of the equation.
First distribute the 3 to both terms inside the parentheses:
3p + 3q = p
Next, move the p term to the other side of the equation by subtracting p from both sides:
3p - p + 3q = 0
Combine like terms:
2p + 3q = 0
Now, isolate p by subtracting 3q from both sides:
2p = -3q
Finally, divide both sides by 2 to solve for p:
p = -3q/2
Therefore, the correct answer is D. p = -3/2q.