first, this is just an expression
not an identity we can prove
there is no = sign
otherwise ..
and
1. There's no such thing as "solving an identity". To solve means to find the value of (or whatever the unknown is) that satisfies an equation. An identity is an equation that is true no matter what the value.
2. You can PROVE an identity - i.e. show that two expressions are identically equal. Is that what you are trying to do? What are you trying to show that this is the same as? Or are you trying to ESTABLISH an identity? What was said above - there is not an equals sign so this is not an identity.