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Yes - the idea of adding a negative number is equivalent to moving left on a number line - just as you do when you subtract a number.
30
Subtracting a fraction is the same as adding its negative.
Subtracting a negative is the same as adding the equivalent positive. For example, subtracting minus 10 is the same as adding 10.
-15. The rule is 'subtracting a positive is the same as adding a negative'
Subtracting 6.