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b in (-oo:+oo)
3-((2/9)*b) = (1/3)*b // - (1/3)*b
3-((2/9)*b)-((1/3)*b) = 0
(-2/9)*b+(-1/3)*b+3 = 0
3-5/9*b = 0 // - 3
-5/9*b = -3 // : -5/9
b = -3/(-5/9)
b = 27/5
b = 27/5
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