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b in (-oo:+oo)
(3/4)*b+1/2 = -1/4 // + -1/4
(3/4)*b+1/2-(-1/4) = 0
(3/4)*b+1/2+1/4 = 0
3/4*b+3/4 = 0 // - 3/4
3/4*b = -3/4 // : 3/4
b = -3/4/3/4
b = -1
b = -1
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