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D( x )
4*x = 0
2*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
1/(2*x)-(3/(4*x)) = 5 // - 5
1/(2*x)-(3/(4*x))-5 = 0
1/(2*x)+(-3/4)*x^-1-5 = 0
-1/4*x^-1 = 5 // : -1/4
x^-1 = -20
-1 < 0
1/(x^1) = -20 // * x^1
1 = -20*x^1 // : -20
-1/20 = x^1
x = -1/20
x = -1/20
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