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b in (-oo:+oo)
1/9-((2/3)*b) = 1/18 // - 1/18
1/9-((2/3)*b)-(1/18) = 0
(-2/3)*b+1/9-1/18 = 0
1/18-2/3*b = 0 // - 1/18
-2/3*b = -1/18 // : -2/3
b = -1/18/(-2/3)
b = 1/12
b = 1/12
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