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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*X-(35/x) = 5/3 // - 5/3
2*X-(35/x)-(5/3) = 0
2*X-35*x^-1-5/3 = 0
-35*x^-1 = -(2*X-5/3) // : -35
x^-1 = (5/3-(2*X))/(-35)
-1 < 0
1/(x^1) = (5/3-(2*X))/(-35) // * x^1
1 = x^1*((5/3-(2*X))/(-35)) // : (5/3-(2*X))/(-35)
-35*(5/3-2*X)^-1 = x^1
x = -35*(5/3-2*X)^-1
x = -35*(5/3-2*X)^-1
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