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b in (-oo:+oo)
3 = (5*b)/8 // - (5*b)/8
3-((5*b)/8) = 0
(-5/8)*b+3 = 0
3-5/8*b = 0 // - 3
-5/8*b = -3 // : -5/8
b = -3/(-5/8)
b = 24/5
b = 24/5
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