If "a" is multiplied or divided by a positive it will be negative.If "a" is added to a number less than 23 it will be negative.
If you add 2, you get 126 which when divided by three equals 42.
There is no such number.
Any number added to its negative equals zero.
16. Negative times divided subtracted or added to another negative number always equals a positive answer.
There is a complement that when added equals one but you may be thinking of multiplying. A number times its reciprocal (multiplicative inverse) is equal to one. A number added to its additive inverse (opposite) is equal to zero.