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b in (-oo:+oo)
(2/9)*b-((2/9)*b) = (1/3)*b-((2/9)*b) // - (1/3)*b-((2/9)*b)
(2/9)*b-((2/9)*b)-((1/3)*b)+(2/9)*b = 0
(2/9)*b+(-2/9)*b+(-1/3)*b+(2/9)*b = 0
-1/9*b = 0 // : -1/9
b = 0
b = 0
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