x + 54 and 5x are complementary angles, adding to 90 degrees.
x + 54 + 5x = 90
6x = 36
x = 6
x is not 6 degrees; the degree sign is separate from the x. x is just 6. Whoever wrote this question should go back to school and learn some math. These questions should be deked into the dustbin of history; it's somebody's harebrained idea that the students need to practice their algebra during geometry or they'll forget it by next year. There are plenty of great ways to combine algebra and geometry; this isn't one of them.
Answer: 6
