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b in (-oo:+oo)
9-((2/5)*b) = 4 // - 4
9-((2/5)*b)-4 = 0
(-2/5)*b-4+9 = 0
5-2/5*b = 0 // - 5
-2/5*b = -5 // : -2/5
b = -5/(-2/5)
b = 25/2
b = 25/2
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