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D( x )
6*x = 0
9*x = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
9*x = 0
9*x = 0
9*x = 0 // : 9
x = 0
x in (-oo:0) U (0:+oo)
(7*x-(4*y))/(6*x)-((4*x-(4*y))/(9*x))-2 = 0
(7*x-4*y)/(6*x)-((4*x-4*y)/(9*x))-2 = 0
(-1*(4*x-4*y))/(9*x)+(7*x-4*y)/(6*x)-2 = 0
(-1*6*x*(4*x-4*y))/(6*9*x*x)+(9*x*(7*x-4*y))/(6*9*x*x)+(-2*6*9*x*x)/(6*9*x*x) = 0
9*x*(7*x-4*y)-1*6*x*(4*x-4*y)-2*6*9*x*x = 0
39*x^2-108*x^2-12*x*y = 0
-69*x^2-12*x*y = 0
-69*x^2-12*x*y = 0
-3*x*(23*x+4*y) = 0
23*x+4*y = 0 // - 4*y
23*x = -(4*y) // : 23
x = (-(4*y))/23
x = (-4*y)/23
-3*x*(x+4/23*y) = 0
(-3*x*(x+4/23*y))/(6*9*x*x) = 0
(-3*x*(x+4/23*y))/(6*9*x*x) = 0 // * 6*9*x*x
-3*x*(x+4/23*y) = 0
( -3*x )
-3*x = 0 // : -3
x = 0
( x+4/23*y )
x+4/23*y = 0 // - 4/23*y
x = -(4/23*y)
x = -4/23*y
x in { 0}
x = -4/23*y
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