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a + a + a - 2a = 3a - 2a = a
2a+5a+9a = 16a
2a = 8 + 4aSubtract 8 from each side:2a - 8 = 4aSubtract 2a from each side:-8 = 2aDivide each side by 2:-4 = a
A=2
a = 1