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b in (-oo:+oo)
-4 = (2/3)*b // - (2/3)*b
-((2/3)*b)-4 = 0
(-2/3)*b-4 = 0
-2/3*b-4 = 0 // + 4
-2/3*b = 4 // : -2/3
b = 4/(-2/3)
b = -6
b = -6
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