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D( x )
x^7 = 0
x+11 = 0
x^7 = 0
x^7 = 0
1*x^7 = 0 // : 1
x^7 = 0
x = 0
x+11 = 0
x+11 = 0
x+11 = 0 // - 11
x = -11
x in (-oo:-11) U (-11:0) U (0:+oo)
(3*x*((X^2+10*x-11)/(x^7)))/(x+11) = 0
(3*x*(X^2+10*x-11))/(x^7*(x+11)) = 0
( 3*x )
3*x = 0 // : 3
x = 0
( X^2+10*x-11 )
X^2+10*x-11 = 0 // - X^2-11
10*x = -(X^2-11) // : 10
x = (-(X^2-11))/10
x = (11-X^2)/10
x in { 0}
x = (11-X^2)/10
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