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A in (-oo:+oo)
A = (1/263)*(6+12) // - (1/263)*(6+12)
A-((1/263)*(6+12)) = 0
A+(-1/263)*(6+12) = 0
A-18/263 = 0 // + 18/263
A = 18/263
A = 18/263
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