13b+6c
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a = 6b = 9a + b = 6 + 9 = 15
Set it up like this: B+9=8+6B+9=14B=5
= a + b - 2
The answer is 144. The compound operator for (a) and (b) in each pair is a * (a+b). For 9 and 7, this is 9 x (9+7) = 9 x 16 = 144.
b = 6