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A in (-oo:+oo)
A/10 = 15/12.5 // - 15/12.5
A/10-(15/12.5) = 0
A/10-1.2 = 0
1/10*A-1.2 = 0 // + 1.2
1/10*A = 1.2 // : 1/10
A = 1.2/1/10
A = 12
A = 12
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