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A in (-oo:+oo)
A/9 = 0.5 // - 0.5
A/9-0.5 = 0
1/9*A-0.5 = 0 // + 0.5
1/9*A = 0.5 // : 1/9
A = 0.5/1/9
A = 4.50000005
A = 4.50000005
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