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b in (-oo:+oo)
(2/3)*b = 7-((5/6)*b) // - 7-((5/6)*b)
(2/3)*b+(5/6)*b-7 = 0
3/2*b-7 = 0 // + 7
3/2*b = 7 // : 3/2
b = 7/3/2
b = 14/3
b = 14/3
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