The world of maths

One starry night, I was reading a maths book for my test in a week's time. Spontaneously, a gargantuan fist leaped out and hauled me into the book itself. I was in a world of maths. A world I loved but I needed to depart. I hesitated if that was 'my final choice but sadly it was the same decision as before. A immense message appeared that stated: solve the x. What could it be? Could it be x marks the spot? I wondered. A massive letter appeared, it was the letter x. Could this be what I was looking for all this time?