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b in (-oo:+oo)
1/3-(2*b) = 8 // - 8
1/3-(2*b)-8 = 0
1/3-2*b-8 = 0
-2*b-23/3 = 0 // + 23/3
-2*b = 23/3 // : -2
b = 23/3/(-2)
b = -23/6
b = -23/6
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