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D( x )
6*x = 0
4*x = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
(9*x-y)/(4*x) = (x+y)/(6*x)+2 // - (x+y)/(6*x)+2
(9*x-y)/(4*x)-((x+y)/(6*x))-2 = 0
(9*x-y)/(4*x)+(-1*(x+y))/(6*x)-2 = 0
(6*x*(9*x-y))/(4*6*x*x)+(-1*4*x*(x+y))/(4*6*x*x)+(-2*4*6*x*x)/(4*6*x*x) = 0
6*x*(9*x-y)-1*4*x*(x+y)-2*4*6*x*x = 0
50*x^2-48*x^2-10*x*y = 0
2*x^2-10*x*y = 0
2*x^2-10*x*y = 0
2*x*(x-5*y) = 0
x-5*y = 0 // + -5*y
x = -(-5*y)
x = 5*y
2*x*(x-5*y) = 0
(2*x*(x-5*y))/(4*6*x*x) = 0
(2*x*(x-5*y))/(4*6*x*x) = 0 // * 4*6*x*x
2*x*(x-5*y) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x-5*y )
x-5*y = 0 // + -5*y
x = -(-5*y)
x = 5*y
x in { 0}
x = 5*y
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