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b in (-oo:+oo)
(4/3)*b-3*b = -40/9 // + -40/9
(4/3)*b-3*b-(-40/9) = 0
(4/3)*b-3*b+40/9 = 0
40/9-5/3*b = 0 // - 40/9
-5/3*b = -40/9 // : -5/3
b = -40/9/(-5/3)
b = 8/3
b = 8/3
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