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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+3/10 = 13/10 // - 13/10
2/x+3/10-(13/10) = 0
2/x+3/10-13/10 = 0
2*x^-1 = 1 // : 2
x^-1 = 1/2
-1 < 0
1/(x^1) = 1/2 // * x^1
1 = 1/2*x^1 // : 1/2
2 = x^1
x = 2
x = 2
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