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b in (-oo:+oo)
4/9 = b/18 // - b/18
4/9-(b/18) = 0
4/9-1/18*b = 0 // - 4/9
-1/18*b = -4/9 // : -1/18
b = -4/9/(-1/18)
b = 8
b = 8
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