It seems like you're referencing an expression or calculation involving different bases, but the specific expressions you meant to include are missing. In general, if you have an expression with different bases, such as \(4^x\) and \(3^y\), these cannot be combined or simplified further unless they can be rewritten in terms of the same base or manipulated in some other way (like logarithmic or exponential properties).
If you can provide the specific mathematical expressions you're referring to, I'd be happy to help clarify or simplify them further!