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b in (-oo:+oo)
-97/40 = b+9/5 // - b+9/5
-b-97/40-(9/5) = 0
-b-97/40-9/5 = 0
-b-169/40 = 0 // + 169/40
-b = 169/40 // * -1
b = -169/40
b = -169/40
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