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D( x )
4/x-7 = 0
x = 0
4/x-7 = 0
4/x-7 = 0
4*x^-1 = 7 // : 4
x^-1 = 7/4
-1 < 0
1/(x^1) = 7/4 // * x^1
1 = 7/4*x^1 // : 7/4
4/7 = x^1
x = 4/7
x = 0
x = 0
x in (-oo:0) U (0:4/7) U (4/7:+oo)
4/(4/x-7)+7 = 0
4/(4*x^-1-7)+7 = 0
4/(4*x^-1-7)+(7*(4*x^-1-7))/(4*x^-1-7) = 0
7*(4*x^-1-7)+4 = 0
28*x^-1-45 = 0
(28*x^-1-45)/(4*x^-1-7) = 0
(28*x^-1-45)/(4*x^-1-7) = 0 // * 4*x^-1-7
28*x^-1-45 = 0
28*x^-1 = 45 // : 28
x^-1 = 45/28
-1 < 0
1/(x^1) = 45/28 // * x^1
1 = 45/28*x^1 // : 45/28
28/45 = x^1
x = 28/45
x = 28/45
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