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A in (-oo:+oo)
A/8 = 1.25 // - 1.25
A/8-1.25 = 0
1/8*A-1.25 = 0 // + 1.25
1/8*A = 1.25 // : 1/8
A = 1.25/1/8
A = 10
A = 10
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