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A in (-oo:+oo)
A/10 = 9/1 // - 9/1
A/10-(9/1) = 0
A/10-9 = 0
1/10*A-9 = 0 // + 9
1/10*A = 9 // : 1/10
A = 9/1/10
A = 90
A = 90
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