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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+(5/3)*y = 1 // - 1
2/x+(5/3)*y-1 = 0
2*x^-1 = -(5/3*y-1) // : 2
x^-1 = (1-(5/3*y))/2
-1 < 0
1/(x^1) = (1-(5/3*y))/2 // * x^1
1 = x^1*((1-(5/3*y))/2) // : (1-(5/3*y))/2
2*(1-5/3*y)^-1 = x^1
x = 2*(1-5/3*y)^-1
x = 2*(1-5/3*y)^-1
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