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D( x )
x = 0
4*x = 0
x = 0
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
1/(4*x)-(2/x) = 3 // - 3
1/(4*x)-(2/x)-3 = 0
1/(4*x)-2*x^-1-3 = 0
-7/4*x^-1 = 3 // : -7/4
x^-1 = -12/7
-1 < 0
1/(x^1) = -12/7 // * x^1
1 = -12/7*x^1 // : -12/7
-7/12 = x^1
x = -7/12
x = -7/12
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