1: 12x - 9y = 6
2: 12x + 20y = 64
Subtract 1 from 2: 29y = 58
y = 2. So does x.
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It is 112
The answer is 64.
It equals 113.
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.
16 + 16 + 16 = 48