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b in (-oo:+oo)
b/4 = 3/7 // - 3/7
b/4-(3/7) = 0
b/4-3/7 = 0
1/4*b-3/7 = 0 // + 3/7
1/4*b = 3/7 // : 1/4
b = 3/7/1/4
b = 12/7
b = 12/7
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