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A in (-oo:+oo)
A/(-23) = -7.9 // + 7.9
A/(-23)+7.9 = 0
7.9-1/23*A = 0 // - 7.9
-1/23*A = -7.9 // : -1/23
A = -7.9/(-1/23)
A = 181.70000363
A = 181.70000363
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