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b in (-oo:+oo)
9-((2/3)*b) = 25/3 // - 25/3
9-((2/3)*b)-(25/3) = 0
(-2/3)*b-25/3+9 = 0
2/3-2/3*b = 0 // - 2/3
-2/3*b = -2/3 // : -2/3
b = -2/3/(-2/3)
b = 1
b = 1
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