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.
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200cm + 3m (300cm) = 500cm (5m)
If n = 7, then 5n + 4 = 5 x 7 + 4 = 39.
In the equation 5n-11=4n+20, n is equal to 31.
5n - 4 = 10n + 6-5n = 10n = -2
5n+4=0 5n=-4 n= -4/5