I don't understand what to do with the first part of the problem.
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Basically this is equation to solve for m
1/ 3 m + 2/3 m = -1
3/3 m = -1
m = -1/ 1 = 1
I think you want to solve for m. If you multiply both sides of the equation by m you will have
1/3+2/3=-m so m=-1 because 1/3+2/3 =1 Does this help?