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b in (-oo:+oo)
-5 = b+(4/5)*(4/5) // - b+(4/5)*(4/5)
-b-((4/5)*(4/5))-5 = 0
-b-16/25-5 = 0
-b-141/25 = 0 // + 141/25
-b = 141/25 // * -1
b = -141/25
b = -141/25
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