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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
18/14 = (b+2)/b // - (b+2)/b
18/14-((b+2)/b) = 0
(-1*(b+2))/b+9/7 = 0
(-1*7*(b+2))/(7*b)+(9*b)/(7*b) = 0
9*b-1*7*(b+2) = 0
2*b-14 = 0
(2*b-14)/(7*b) = 0
(2*b-14)/(7*b) = 0 // * 7*b
2*b-14 = 0
2*b-14 = 0 // + 14
2*b = 14 // : 2
b = 14/2
b = 7
b = 7
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