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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)
3/x+3 = 4/(5*x)+31/10 // - 4/(5*x)+31/10
3/x-(4/(5*x))-(31/10)+3 = 0
3/x+(-4/5)*x^-1-31/10+3 = 0
11/5*x^-1 = 1/10 // : 11/5
x^-1 = 1/22
-1 < 0
1/(x^1) = 1/22 // * x^1
1 = 1/22*x^1 // : 1/22
22 = x^1
x = 22
x = 22
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