It is abs(54 - 7*n) or |54 - 7*n|
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It is simply a variable - it represents a number which can take different values.
An expression
The question should be what is the variable in the following expression? (n + 5) The answer: (n) represents the variable. See: Variable(English definition) then look up the Math/Algebra definition.
whats the problem?????
x