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D( x )
x = 0
6/(x^2)+7/10 = 0
x^2 = 0
x = 0
x = 0
6/(x^2)+7/10 = 0
6/(x^2)+7/10 = 0
6*x^-2 = -7/10 // : 6
x^-2 = -7/60
-2 < 0
1/(x^2) = -7/60 // * x^2
1 = -7/60*x^2 // : -7/60
-60/7 = x^2
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/6-(4/x))/(6/(x^2)+7/10) = 0
(1/6-4*x^-1)/(6/(x^2)+7/10) = 0
(1/6-4*x^-1)/(6*x^-2+7/10) = 0
-4*x^-1 = -1/6 // : -4
x^-1 = 1/24
-1 < 0
1/(x^1) = 1/24 // * x^1
1 = 1/24*x^1 // : 1/24
24 = x^1
x = 24
x = 24
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