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Without any equality signs the given terms can't be classed as equations.
5n + 3m This has an unknown value without more information. If you know the value of n and m then you can substitute and get a value for the expression.
It seems like your question is incomplete or unclear. If you could provide more context or clarify what "3m in a b" refers to, I would be happy to help!
It is an algebraic expression which cannot be evaluated without information about m.
3m*3m*2m=300*300*200=18,000,000cm3