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b in (-oo:+oo)
(1/2)*(1*b-2) = 5 // - 5
(1/2)*(1*b-2)-5 = 0
(1/2)*(b-2)-5 = 0
1/2*(b-2)-5 = 0
1/2*(b-2)-5 = 0
1/2*b-6 = 0
1/2*b-6 = 0
1/2*b-6 = 0 // + 6
1/2*b = 6 // : 1/2
b = 6/1/2
b = 12
b = 12
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