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b in (-oo:+oo)
2-(3*b) = 11-((15*b)/7) // - 11-((15*b)/7)
(15*b)/7-(3*b)-11+2 = 0
(15*b)/7-3*b-11+2 = 0
-6/7*b-9 = 0 // + 9
-6/7*b = 9 // : -6/7
b = 9/(-6/7)
b = -21/2
b = -21/2
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