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A in (-oo:+oo)
A/(-8) = 3.6 // - 3.6
A/(-8)-3.6 = 0
-1/8*A-3.6 = 0 // + 3.6
-1/8*A = 3.6 // : -1/8
A = 3.6/(-1/8)
A = -28.8
A = -28.8
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