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b in (-oo:+oo)
-1 = (b-5)/9 // - (b-5)/9
-((b-5)/9)-1 = 0
(-1*(b-5))/9-1 = 0
(-1*(b-5))/9+(-1*9)/9 = 0
-1*(b-5)-1*9 = 0
-b-4 = 0
(-b-4)/9 = 0
(-b-4)/9 = 0 // * 9
-b-4 = 0
-b-4 = 0 // + 4
-b = 4 // * -1
b = -4
b = -4
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