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b in (-oo:+oo)
(-8/3)*b = 5/1 // - 5/1
(-8/3)*b-(5/1) = 0
(-8/3)*b-5 = 0
-8/3*b-5 = 0 // + 5
-8/3*b = 5 // : -8/3
b = 5/(-8/3)
b = -15/8
b = -15/8
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