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b in (-oo:+oo)
3*b+5/8 = 11/56 // - 11/56
3*b+5/8-(11/56) = 0
3*b+5/8-11/56 = 0
3*b+3/7 = 0 // - 3/7
3*b = -3/7 // : 3
b = -3/7/3
b = -1/7
b = -1/7
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