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Pi is a number the ancient Greeks came up with. Essentially, a great philosopher took a ribbon and put it around a perfect circle.
What he found is that a circle with diameter R, no matter the size, always has a circumference of approximately 2R*3.14...
That's...

You have: (21y5-42y4+49y3)/7y3.
1. Do it one at a time. Start with the constants. You have a bunch of numbers- 21, 42, 49, over 7. Notice anything about those numbers- 21, 42, 49? They're all factors of 7.
21/7 is 3, 42/7 is 6, 49/7 is 7.
Simplify...