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b in (-oo:+oo)
b-((4/5)*b)-1/9 = 22/45 // - 22/45
b-((4/5)*b)-1/9-(22/45) = 0
(-4/5)*b+b-1/9-22/45 = 0
1/5*b-3/5 = 0 // + 3/5
1/5*b = 3/5 // : 1/5
b = 3/5/1/5
b = 3
b = 3
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