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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2-7/x = -(3/x)-4-3 // + -(3/x)-4-3
3/x-7/x+2+3+4 = 0
-4*x^-1 = -9 // : -4
x^-1 = 9/4
-1 < 0
1/(x^1) = 9/4 // * x^1
1 = 9/4*x^1 // : 9/4
4/9 = x^1
x = 4/9
x = 4/9
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