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D( x )
x = 0
7*x = 0
x = 0
x = 0
7*x = 0
7*x = 0
7*x = 0 // : 7
x = 0
x in (-oo:0) U (0:+oo)
5/(7*x) = 52/7-(3/x) // - 52/7-(3/x)
5/(7*x)+3/x-(52/7) = 0
5/(7*x)+3/x-52/7 = 0
26/7*x^-1 = 52/7 // : 26/7
x^-1 = 2
-1 < 0
1/(x^1) = 2 // * x^1
1 = 2*x^1 // : 2
1/2 = x^1
x = 1/2
x = 1/2
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