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b in (-oo:+oo)
b/19-((4*b)/19) = 18/19 // - 18/19
b/19-((4*b)/19)-(18/19) = 0
b/19+(-4/19)*b-18/19 = 0
-3/19*b-18/19 = 0 // + 18/19
-3/19*b = 18/19 // : -3/19
b = 18/19/(-3/19)
b = -6
b = -6
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