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D( x )
7*x-2 = 0
7*x-2 = 0
7*x-2 = 0
7*x-2 = 0 // + 2
7*x = 2 // : 7
x = 2/7
x in (-oo:2/7) U (2/7:+oo)
y = (8*e^4*x)/(7*x-2) // - (8*e^4*x)/(7*x-2)
y-((8*e^4*x)/(7*x-2)) = 0
y-8*e^4*x*(7*x-2)^-1 = 0
(-8*e^4*x)/(7*x-2)+y = 0
(-8*e^4*x)/(7*x-2)+(y*(7*x-2))/(7*x-2) = 0
y*(7*x-2)-8*e^4*x = 0
7*x*y-8*e^4*x-2*y = 0
7*x*y-8*e^4*x-2*y = 0
7*x*y-2*y = 0 // + -2*y
7*x*y = -(-2*y) // : 7*y
x = (-(-2*y))/(7*y)
x = 2/7
x-2/7 = 0
(x-2/7)/(7*x-2) = 0
(x-2/7)/(7*x-2) = 0 // * 7*x-2
x-2/7 = 0
x-2/7 = 0 // + 2/7
x = 2/7
x in { 2/7}
x belongs to the empty set
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