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b in (-oo:+oo)
4/9 = b/15 // - b/15
4/9-(b/15) = 0
4/9-1/15*b = 0 // - 4/9
-1/15*b = -4/9 // : -1/15
b = -4/9/(-1/15)
b = 20/3
b = 20/3
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