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b in (-oo:+oo)
b/19-((4*b)/19) = 6/19 // - 6/19
b/19-((4*b)/19)-(6/19) = 0
b/19+(-4/19)*b-6/19 = 0
-3/19*b-6/19 = 0 // + 6/19
-3/19*b = 6/19 // : -3/19
b = 6/19/(-3/19)
b = -2
b = -2
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