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A in (-oo:+oo)
A/(-5) = 2/11 // - 2/11
A/(-5)-(2/11) = 0
A/(-5)-2/11 = 0
-1/5*A-2/11 = 0 // + 2/11
-1/5*A = 2/11 // : -1/5
A = 2/11/(-1/5)
A = -10/11
A = -10/11
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