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b in (-oo:+oo)
(1/2)*b-6 = -1/2 // + -1/2
(1/2)*b-(-1/2)-6 = 0
(1/2)*b+1/2-6 = 0
1/2*b-11/2 = 0 // + 11/2
1/2*b = 11/2 // : 1/2
b = 11/2/1/2
b = 11
b = 11
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