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b in (-oo:+oo)
(1/2)*(b+6)-(3/2) = -1 // + 1
(1/2)*(b+6)-(3/2)+1 = 0
(1/2)*(b+6)-3/2+1 = 0
1/2*(b+6)-3/2+1 = 0
(1/2*2*(b+6))/2-3/2+(1*2)/2 = 0
1/2*2*(b+6)+1*2-3 = 0
b+2+3 = 0
b+5 = 0
(b+5)/2 = 0
(b+5)/2 = 0 // * 2
b+5 = 0
b+5 = 0 // - 5
b = -5
b = -5
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