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A in (-oo:+oo)
A/8 = 6/4 // - 6/4
A/8-(6/4) = 0
A/8-3/2 = 0
1/8*A-3/2 = 0 // + 3/2
1/8*A = 3/2 // : 1/8
A = 3/2/1/8
A = 12
A = 12
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