69 + 69 = 138.
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x=11+69/2 and x=11-69/2
69
This is the existence of additive inverse: For every number, x, there exists a number, denoted by (-x), such that x + (-x) = (-x) + x = 0.
69% = 69/100 = 0.69/1 = 0.69
It is 69/10000 = 0.0069