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It could represent an unknown variable in an expression or an equation.
None of these could represent anything!
-9
You could write "divided by" between the expression for the numerator and the expression for the denominator.
* If "a" is positive, "-a" is negative.* If "a" is negative, "-a" is positive. * If "a" is zero, "-a" is zero. If you want to force a negative number, you can write -|a|, i.e., the negative of the absolute value.