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a + a + 8b = 12
2a + 8b = 12
u3 + u9 = 14
a + 2b + a + 8b = 14
2a + 10b = 14
2a + 8b = 12
2a + 10b = 14
-2b = -2
b= 1
2a + 8(1) = 12
2a + 8 = 12
2a = 4
a = 2