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b in (-oo:+oo)
b/4 = b/12+2/3 // - b/12+2/3
b/4-(b/12)-(2/3) = 0
b/4-(b/12)-2/3 = 0
1/6*b-2/3 = 0 // + 2/3
1/6*b = 2/3 // : 1/6
b = 2/3/1/6
b = 4
b = 4
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