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D( x )
x = 0
5*x = 0
x = 0
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
2/x+3/5 = 22/(5*x) // - 22/(5*x)
2/x-(22/(5*x))+3/5 = 0
2/x+(-22/5)*x^-1+3/5 = 0
-12/5*x^-1 = -3/5 // : -12/5
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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