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