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b in (-oo:+oo)
b/19-((9*b)/19) = 56/19 // - 56/19
b/19-((9*b)/19)-(56/19) = 0
b/19+(-9/19)*b-56/19 = 0
-8/19*b-56/19 = 0 // + 56/19
-8/19*b = 56/19 // : -8/19
b = 56/19/(-8/19)
b = -7
b = -7
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