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A in (-oo:+oo)
A/15 = 5/5 // - 5/5
A/15-(5/5) = 0
A/15-1 = 0
1/15*A-1 = 0 // + 1
1/15*A = 1 // : 1/15
A = 1/1/15
A = 15
A = 15
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