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