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b in (-oo:+oo)
4/5 = b/30 // - b/30
4/5-(b/30) = 0
4/5-1/30*b = 0 // - 4/5
-1/30*b = -4/5 // : -1/30
b = -4/5/(-1/30)
b = 24
b = 24
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