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D( b )
b-10 = 0
b-10 = 0
b-10 = 0
b-10 = 0 // + 10
b = 10
b in (-oo:10) U (10:+oo)
7/9 = b/(b-10) // - b/(b-10)
7/9-(b/(b-10)) = 0
(-1*b)/(b-10)+7/9 = 0
(-1*9*b)/(9*(b-10))+(7*(b-10))/(9*(b-10)) = 0
7*(b-10)-1*9*b = 0
-2*b-70 = 0
(-2*b-70)/(9*(b-10)) = 0
(-2*b-70)/(9*(b-10)) = 0 // * 9*(b-10)
-2*b-70 = 0
-2*b-70 = 0 // + 70
-2*b = 70 // : -2
b = 70/(-2)
b = -35
b = -35
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