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D( x )
x^3+27 = 0
x^3+27 = 0
x^3+27 = 0
1*x^3 = -27 // : 1
x^3 = -27
x^3 = -27 // ^ 1/3
x = -3
x in (-oo:-3) U (-3:+oo)
((8-x)^3*(7*x-6))/(x^3+27) = 0
( 7*x-6 )
7*x-6 = 0 // + 6
7*x = 6 // : 7
x = 6/7
( 8-x )
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x in { 6/7, 8, 8, 8 }
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