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b in (-oo:+oo)
-2 = b+1*(-1/5) // - b+1*(-1/5)
-b-(1*(-1/5))-2 = 0
1/5-b-2 = 0
-b-9/5 = 0 // + 9/5
-b = 9/5 // * -1
b = -9/5
b = -9/5
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