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b in (-oo:+oo)
9-((5/3)*b) = 3 // - 3
9-((5/3)*b)-3 = 0
(-5/3)*b-3+9 = 0
6-5/3*b = 0 // - 6
-5/3*b = -6 // : -5/3
b = -6/(-5/3)
b = 18/5
b = 18/5
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