8-n
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n-8
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.
The corresponding equation, is solve n when :- 2(n - 4) = -8 2n - 8 = -8 2n = -8 + 8 = 0 n = 0
7 - n
This is simple algebra. Let the unknown number be n. Then the sum of this number and 8 = n + 8.