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b in (-oo:+oo)
3 = b-5*(-2/3) // - b-5*(-2/3)
3-b-(-5*(-2/3)) = 0
3-b-10/3 = 0
-b-1/3 = 0 // + 1/3
-b = 1/3 // * -1
b = -1/3
b = -1/3
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