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A in (-oo:+oo)
A/12 = 3/9 // - 3/9
A/12-(3/9) = 0
A/12-1/3 = 0
1/12*A-1/3 = 0 // + 1/3
1/12*A = 1/3 // : 1/12
A = 1/3/1/12
A = 4
A = 4
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