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b in (-oo:+oo)
b/19-((8*b)/19) = 63/19 // - 63/19
b/19-((8*b)/19)-(63/19) = 0
b/19+(-8/19)*b-63/19 = 0
-7/19*b-63/19 = 0 // + 63/19
-7/19*b = 63/19 // : -7/19
b = 63/19/(-7/19)
b = -9
b = -9
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