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b in (-oo:+oo)
(4/1)*b = -1/2 // + -1/2
(4/1)*b-(-1/2) = 0
4*b+1/2 = 0
4*b+1/2 = 0 // - 1/2
4*b = -1/2 // : 4
b = -1/2/4
b = -1/8
b = -1/8
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