(9m+6)+(-5m-6)
a. 4m+12
b.14m+12
c.14m-12
d.4m

C.) 14-12

move the like terms first.

(9m+5m)+(-6-6)
=14m-12

What is the rest of the question?

You move the constant to the right side and change its sign to be 9z= -6 -8. that’s the first step.the second step would be calculate the difference of -8-6 to get -14. you equation should now be 9z=-14the last step is to divide both sides by 9 to get z=-14/9hope this