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b in (-oo:+oo)
-2 = b+4*(-2/5) // - b+4*(-2/5)
-b-(4*(-2/5))-2 = 0
8/5-b-2 = 0
-b-2/5 = 0 // + 2/5
-b = 2/5 // * -1
b = -2/5
b = -2/5
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