Find the exact value of the given expression using a sum or difference formula. 
Definitions:
Adenine
A nucleobase (a building block for DNA and RNA) that pairs with thymine in DNA and with uracil in RNA.
Hydrogen Bonds
A type of weak chemical bond formed when the slightly positive hydrogen atom of one molecule is attracted to the slightly negative atom of another molecule, often oxygen or nitrogen.
Guanine
One of the four main nucleobases found in the nucleic acids DNA and RNA, characterized by its ability to form three hydrogen bonds when paired with cytosine.
Cytosine
A nitrogenous base found in DNA and RNA molecules, pairing with guanine in the genetic code.
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