By using c-5=3or2
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Lets assume the number = x. Also the expression means a function of x, f(x) which is often simply called y.So to show less than a number (x) the expression would read:f(x) = x-5 or y = x-5 Hope this helps.
|5n - 2n|
7n+5
5+4x
4x - 5