I'm trying to figure out how the book got this answer?

[Dahookup29]

Adding using the LCD
Its 5/12+7/30 they did this

5/2x2x3 x 5/5 + 7/2x3x5 x 2/2

I'm trying to figure out how they got the 5/5 n the 2/2. They said by multiplying by the forms of 1.

I'm lost