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b in (-oo:+oo)
(1/2)*b-2 = -1/4 // + -1/4
(1/2)*b-(-1/4)-2 = 0
(1/2)*b+1/4-2 = 0
1/2*b-7/4 = 0 // + 7/4
1/2*b = 7/4 // : 1/2
b = 7/4/1/2
b = 7/2
b = 7/2
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