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b in (-oo:+oo)
5/6-((4/7)*b) = -229/42 // + -229/42
5/6-((4/7)*b)-(-229/42) = 0
(-4/7)*b+5/6+229/42 = 0
44/7-4/7*b = 0 // - 44/7
-4/7*b = -44/7 // : -4/7
b = -44/7/(-4/7)
b = 11
b = 11
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