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b in (-oo:+oo)
-32 = b/8-25 // - b/8-25
25-(b/8)-32 = 0
-1/8*b-7 = 0 // + 7
-1/8*b = 7 // : -1/8
b = 7/(-1/8)
b = -56
b = -56
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