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b in (-oo:+oo)
4/9-3*b = -185/9 // + -185/9
4/9-3*b-(-185/9) = 0
4/9-3*b+185/9 = 0
21-3*b = 0 // - 21
-3*b = -21 // : -3
b = -21/(-3)
b = 7
b = 7
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