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b in (-oo:+oo)
(-4/6)*b = 5/9 // - 5/9
(-4/6)*b-(5/9) = 0
(-4/6)*b-5/9 = 0
-2/3*b-5/9 = 0 // + 5/9
-2/3*b = 5/9 // : -2/3
b = 5/9/(-2/3)
b = -5/6
b = -5/6
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