Solve: x/3 + x/4 = 7 A 12 B 84 C 7 D 21 ✓ Correct Answer: Option A LCD = 12. 4x/12 + 3x/12 = 7; 7x/12 = 7; x = 12. Practice ACT Exam Prep Quizzes → Browse All Questions Study Flashcards