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b in (-oo:+oo)
1/3-((2*b)/3) = 7/3 // - 7/3
1/3-((2*b)/3)-(7/3) = 0
(-2/3)*b+1/3-7/3 = 0
-2/3*b-2 = 0 // + 2
-2/3*b = 2 // : -2/3
b = 2/(-2/3)
b = -3
b = -3
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