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b in (-oo:+oo)
2*(b-(1/2))+(1/3)*b = 0
2*(b-1/2)+(1/3)*b = 0
2*(b-1/2)+b/3 = 0
(2*3*(b-1/2))/3+b/3 = 0
2*3*(b-1/2)+b = 0
7*b-3 = 0
(7*b-3)/3 = 0
(7*b-3)/3 = 0 // * 3
7*b-3 = 0
7*b-3 = 0 // + 3
7*b = 3 // : 7
b = 3/7
b = 3/7
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