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b in (-oo:+oo)
(1/2)*(b-3)-(5/2) = 0
(1/2)*(b-3)-5/2 = 0
1/2*(b-3)-5/2 = 0
(1/2*2*(b-3))/2-5/2 = 0
1/2*2*(b-3)-5 = 0
b-8 = 0
(b-8)/2 = 0
(b-8)/2 = 0 // * 2
b-8 = 0
b-8 = 0 // + 8
b = 8
b = 8
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