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b in (-oo:+oo)
b/19-((8*b)/19) = 28/19 // - 28/19
b/19-((8*b)/19)-(28/19) = 0
b/19+(-8/19)*b-28/19 = 0
-7/19*b-28/19 = 0 // + 28/19
-7/19*b = 28/19 // : -7/19
b = 28/19/(-7/19)
b = -4
b = -4
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