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b in (-oo:+oo)
6*(2*b-1) = 78 // - 78
6*(2*b-1)-78 = 0
6*(2*b-1)-78 = 0
12*b-84 = 0
12*b-84 = 0
12*b-84 = 0 // + 84
12*b = 84 // : 12
b = 84/12
b = 7
b = 7
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