If 3M + 7 and - 18 are opposite to each other, then M = ()

If 3M + 7 and - 18 are opposite to each other, then M = ()

3m+7=-(-18)
3m+7=18
3m=11
m=11/3
Note that if there are two numbers a and B, B is not 0 and a / b = - 1, then a and B are opposite to each other
The opposite of 0 is 0