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