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b in (-oo:+oo)
(3/5)*b+b-(8/9) = -904/45 // + -904/45
(3/5)*b+b-(8/9)-(-904/45) = 0
(3/5)*b+b-8/9+904/45 = 0
8/5*b+96/5 = 0 // - 96/5
8/5*b = -96/5 // : 8/5
b = -96/5/8/5
b = -12
b = -12
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