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b in (-oo:+oo)
(2/3)*b-5 = 4 // - 4
(2/3)*b-5-4 = 0
2/3*b-9 = 0 // + 9
2/3*b = 9 // : 2/3
b = 9/2/3
b = 27/2
b = 27/2
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