It is impossible to give any decimal/numeric value if we are not given the values of at least one variable, so the answer is B + B + B + C + C + C.
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b + b + b + c + c + c + c = 3b + 4c
If: a = b+c+d Then: c = a-b-d
x + y + z = 0 x = a - b, y = b - c, z = c - a, therefore a - b + b - c + c - a = ? a - a + b - b + c - c = 0
A=0 b=0 c=0
the answer is a