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b in (-oo:+oo)
(2/5)*b+3 = 11-((2/5)*b) // - 11-((2/5)*b)
(2/5)*b+(2/5)*b-11+3 = 0
4/5*b-8 = 0 // + 8
4/5*b = 8 // : 4/5
b = 8/4/5
b = 10
b = 10
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