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