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