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b in (-oo:+oo)
5*b+(2/5)*b-(2/9) = 862/495 // - 862/495
5*b+(2/5)*b-(2/9)-(862/495) = 0
5*b+(2/5)*b-2/9-862/495 = 0
27/5*b-108/55 = 0 // + 108/55
27/5*b = 108/55 // : 27/5
b = 108/55/27/5
b = 4/11
b = 4/11
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