due to the fact that 2 negatives cannot equal a negative, even when subtracting.
you must change the sign or else it will cause a major syntax error.
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The product of two positive numbers or two negative numbers is a positive number.
5^-2 can be expressed as; 1/5^2 = 1/25 positive
A positive number divided by a negative number equals a negative number.
A negative number multiplied by another negative number equals a positive number. For example, -5 · -5 = positive 25.
The sum can go either way. The sign of the sum will be the same as the sign of whichever original number is bigger (without regard for signs).