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b in (-oo:+oo)
3/2 = b/8 // - b/8
3/2-(b/8) = 0
3/2-1/8*b = 0 // - 3/2
-1/8*b = -3/2 // : -1/8
b = -3/2/(-1/8)
b = 12
b = 12
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