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