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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2-4/x = -5 // + 5
2-4/x+5 = 0
-4*x^-1 = -7 // : -4
x^-1 = 7/4
-1 < 0
1/(x^1) = 7/4 // * x^1
1 = 7/4*x^1 // : 7/4
4/7 = x^1
x = 4/7
x = 4/7
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