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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.
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Continue Learning about Other Math
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it has to have an x number in it.
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The expression is: b/8
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