If the vectors a and b are arranged so that the head of a (the arrow bit) is at the tail of b, then c must be from the tail of a to the head of b. The vectors a and b can be swapped since vector addition is commutative.
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When b is zero.
A+c= 2a+b
a=24 b=16 c=18
Because there is no way to define the divisors, the equations cannot be evaluated.
2s-2b= a+b+c-2b simplified that would be a+c-b.