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b in (-oo:+oo)
(1/5)*b = 9-((2/5)*b) // - 9-((2/5)*b)
(1/5)*b+(2/5)*b-9 = 0
3/5*b-9 = 0 // + 9
3/5*b = 9 // : 3/5
b = 9/3/5
b = 15
b = 15
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