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b in (-oo:+oo)
(5/6)*b+4 = 7/3 // - 7/3
(5/6)*b-(7/3)+4 = 0
(5/6)*b-7/3+4 = 0
5/6*b+5/3 = 0 // - 5/3
5/6*b = -5/3 // : 5/6
b = -5/3/5/6
b = -2
b = -2
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