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b in (-oo:+oo)
7*b+1/4 = 57/4 // - 57/4
7*b+1/4-(57/4) = 0
7*b+1/4-57/4 = 0
7*b-14 = 0 // + 14
7*b = 14 // : 7
b = 14/7
b = 2
b = 2
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