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b in (-oo:+oo)
b/19-((3*b)/19) = 10/19 // - 10/19
b/19-((3*b)/19)-(10/19) = 0
b/19+(-3/19)*b-10/19 = 0
-2/19*b-10/19 = 0 // + 10/19
-2/19*b = 10/19 // : -2/19
b = 10/19/(-2/19)
b = -5
b = -5
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