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b in (-oo:+oo)
b+2/3 = 8*b-191 // - 8*b-191
b-(8*b)+2/3+191 = 0
b-8*b+2/3+191 = 0
575/3-7*b = 0 // - 575/3
-7*b = -575/3 // : -7
b = -575/3/(-7)
b = 575/21
b = 575/21
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