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