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**1. The problem statement, all variables and given/known data**

"a" vector - "b" vector = 7m(i) + -3.5m(j) + -4.5m(k)

A third vector "c" vector pops out of nowhere.

Find the new unit-vector notation such that "a" vector - "b" vector + "c" vector = 0

???m(i) + ???m(j) + ???m(k)

**2. Relevant equations**

a - b + c = 0

**3. The attempt at a solution**

c = b - a? <<< How do you do it backwards?