If you do not assume that "plus" is commutative, all that can be said that it is equal to A plus B.
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the answer is a
A.
A=0 b=0 c=0
2a. (a, b and c are all equal.)
2x - 13x + 42 = x +ax + b a + b = 2(x - 6.5x + 21) = 34 = a + b