How do I plot a gigantic function easily on WA?

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I need to graph a gigantic function on WA, that has other functions inside it and some constants with preassigned values that come up a lot! For example:

W = QbBesselK...., in which Q is an equation like Q = x*b + ..., and b has a said value.

Is there a way to write this as

Being b = 10 and Q = x*b + ...,

Plot[QbBesselK]?

I'm new to Wolfram Mathematica and this would help me a lot.