Subtracting 7 from a number is the same as finding the result of adding the opposite of 7 to that number. In mathematical terms, this is represented as x - 7 = x + (-7). So, if you have a number x and you subtract 7 from it, you are essentially adding -7 to x.
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Well, darling, if you take any number and subtract 7 from it, you're basically just moving 7 steps back on the number line. So, if you started at 10 and took away 7, you'd end up at 3. Simple math, really.
Placing a question mark at the end of a list of expressions or numbers does not make it a sensible question. Try to use a whole phrase (sentence) to describe what it is that you want answered.