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