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b in (-oo:+oo)
(3/5)*(2*b-3) = 9 // - 9
(3/5)*(2*b-3)-9 = 0
3/5*(2*b-3)-9 = 0
3/5*(2*b-3)-9 = 0
6/5*b-54/5 = 0
6/5*b-54/5 = 0
6/5*b-54/5 = 0 // + 54/5
6/5*b = 54/5 // : 6/5
b = 54/5/6/5
b = 9
b = 9
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