If the vector 3M + 2n = a.m-n = B, denote Mn with ab

If the vector 3M + 2n = a.m-n = B, denote Mn with ab

2m-2n = 2B, 3M + 2n = a, add the two formulas, 5m = a + 2B, so m = (a + 2b) / 5. Similarly, we can get n, or substitute it