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b in (-oo:+oo)
-4*b = 8/3 // - 8/3
-4*b-(8/3) = 0
-4*b-8/3 = 0
-4*b-8/3 = 0 // + 8/3
-4*b = 8/3 // : -4
b = 8/3/(-4)
b = -2/3
b = -2/3
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