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b in (-oo:+oo)
-4 = (5/9)*b // - (5/9)*b
-((5/9)*b)-4 = 0
(-5/9)*b-4 = 0
-5/9*b-4 = 0 // + 4
-5/9*b = 4 // : -5/9
b = 4/(-5/9)
b = -36/5
b = -36/5
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