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b in (-oo:+oo)
(-1/6)*b+(1/3)*b+1 = 3 // - 3
(-1/6)*b+(1/3)*b-3+1 = 0
1/6*b-2 = 0 // + 2
1/6*b = 2 // : 1/6
b = 2/1/6
b = 12
b = 12
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