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b in (-oo:+oo)
4-((2/3)*b) = 5 // - 5
4-((2/3)*b)-5 = 0
(-2/3)*b-5+4 = 0
-2/3*b-1 = 0 // + 1
-2/3*b = 1 // : -2/3
b = 1/(-2/3)
b = -3/2
b = -3/2
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