-3 -12 = -15
It's basically adding with the positives, if all of the minus signs were plusses, if that's not too confusing.
-x-y = -(x+y)
eg. -1-2= -(1+2) = -3
Our teacher told us to look at number lines if we had any trouble?
Hope this helps :)
what is the number that is twelve less than a number is negative 3?
-3 😎
-15