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b in (-oo:+oo)
2-7*b = 67/9 // - 67/9
2-7*b-(67/9) = 0
2-7*b-67/9 = 0
-7*b-49/9 = 0 // + 49/9
-7*b = 49/9 // : -7
b = 49/9/(-7)
b = -7/9
b = -7/9
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