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A in (-oo:+oo)
(A^1)/2 = -12-5 // + -12-5
(A^1)/2+5+12 = 0
A/2+5+12 = 0
1/2*A+17 = 0 // - 17
1/2*A = -17 // : 1/2
A = -17/1/2
A = -34
A = -34
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