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b in (-oo:+oo)
-118/45 = -2*b-((3/5)*b)-(8/9) // + -2*b-((3/5)*b)-(8/9)
(3/5)*b-(-2*b)-118/45+8/9 = 0
2*b+(3/5)*b-118/45+8/9 = 0
13/5*b-26/15 = 0 // + 26/15
13/5*b = 26/15 // : 13/5
b = 26/15/13/5
b = 2/3
b = 2/3
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