n+81
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N + 5 With "N" being the variable.
a coefficient of n
3n+18 is an algebraic expression and n is an unknown variable
In this case N is variable for a math sentence. If the equation is n+7=9 n would equal 2.
n - 8 is the expression for the difference of eight and a number.'Number' is a variable, so the variable must be a letter (in this case, 'n'). 'The difference' is going to be the subtraction symbol that is in between the 'number' and eight, so it must be n - 8. It could, of course, be 8 - n.