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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/x+7)*(y+3/7) = 5/9+65 // - 5/9+65
(7/x+7)*(y+3/7)-(5/9)-65 = 0
(7/x+7)*(y+3/7)-5/9-65 = 0
(7*x^-1+7)*(y+3/7)-5/9-65 = 0
(9*(7*x^-1+7)*(y+3/7))/9-5/9+(-65*9)/9 = 0
9*(7*x^-1+7)*(y+3/7)-65*9-5 = 0
27*x^-1+63*x^-1*y+63*y-585+22 = 0
27*x^-1+63*x^-1*y+63*y-563 = 0
27*x^-1+63*x^-1*y+63*y-563 = 0
27*x^-1-563*x^0 = 0
(27*x^0-563*x^1)/(x^1) = 0 // * x^2
x^1*(27*x^0-563*x^1) = 0
x^1
27-563*x = 0
-563*x^1 = -27 // : -563
x^1 = 27/563
x = 27/563
x in { 27/563}
x-27/563 = 0
(x-27/563)/9 = 0
(x-27/563)/9 = 0 // * 9
x-27/563 = 0
x-27/563 = 0 // + 27/563
x = 27/563
x = 27/563
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