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b in (-oo:+oo)
3*b+1/7 = 169/7 // - 169/7
3*b+1/7-(169/7) = 0
3*b+1/7-169/7 = 0
3*b-24 = 0 // + 24
3*b = 24 // : 3
b = 24/3
b = 8
b = 8
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