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b in (-oo:+oo)
4/9-((2/3)*b) = -8/9 // + -8/9
4/9-((2/3)*b)-(-8/9) = 0
(-2/3)*b+4/9+8/9 = 0
4/3-2/3*b = 0 // - 4/3
-2/3*b = -4/3 // : -2/3
b = -4/3/(-2/3)
b = 2
b = 2
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