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b in (-oo:+oo)
-97/40 = b-9/5 // - b-9/5
-b-97/40-(-9/5) = 0
9/5-b-97/40 = 0
-b-5/8 = 0 // + 5/8
-b = 5/8 // * -1
b = -5/8
b = -5/8
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