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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.25/3.5 = 2.125/x // - 2.125/x
4.25/3.5-(2.125/x) = 0
4.25/3.5-2.125*x^-1 = 0
-2.125*x^-1 = -1.21428571 // : -2.125
x^-1 = 0.57142857
-1 < 0
1/(x^1) = 0.57142857 // * x^1
1 = 0.57142857*x^1 // : 0.57142857
1.75 = x^1
x = 1.75
x = 1.75
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