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b in (-oo:+oo)
2-3*b = 26/7 // - 26/7
2-3*b-(26/7) = 0
2-3*b-26/7 = 0
-3*b-12/7 = 0 // + 12/7
-3*b = 12/7 // : -3
b = 12/7/(-3)
b = -4/7
b = -4/7
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