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D( x )
7*x = 0
x = 0
7*x = 0
7*x = 0
7*x = 0 // : 7
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x-9)/x+(9*x-8)/(7*x) = y // - y
(4*x-9)/x+(9*x-8)/(7*x)-y = 0
(7*x*(4*x-9))/(7*x*x)+(x*(9*x-8))/(7*x*x)+(7*x*x*(-y))/(7*x*x) = 0
7*x*(4*x-9)+x*(9*x-8)+7*x*x*(-y) = 0
37*x^2-71*x-7*x^2*y = 0
37*x^2-71*x-7*x^2*y = 0
x*(37*x-7*x*y-71) = 0
-7*x*y-71 = 0 // + 71
-7*x*y = 71 // : -7*y
x = 71/(-7*y)
x*(x+71/7*y^-1) = 0
(x*(x+71/7*y^-1))/(7*x*x) = 0
(x*(x+71/7*y^-1))/(7*x*x) = 0 // * 7*x*x
x*(x+71/7*y^-1) = 0
( x+71/7*y^-1 )
x+71/7*y^-1 = 0 // - 71/7*y^-1
x = -(71/7*y^-1)
x = -71/7*y^-1
( x )
x = 0
x in { 0}
x = -71/7*y^-1
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