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b in (-oo:+oo)
3*b = 4/7 // - 4/7
3*b-(4/7) = 0
3*b-4/7 = 0
3*b-4/7 = 0 // + 4/7
3*b = 4/7 // : 3
b = 4/7/3
b = 4/21
b = 4/21
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