Answer:
-m - 3n + 12
Step-by-step explanation:
Because we don't know the values of "m" and "n" the simplest form you can get the equation to be is -m + - 3n + 12
That is because with a negative in front of the parenthesis it's like multiplying by negative 1. So -1 x m, -1 x 3n, and -1 x -12.
