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D( x )
5-x = 0
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x in (-oo:5) U (5:+oo)
(((x-5)*(7*x+2))/(5-x))*(7*x+2) = 0
((x-5)*(7*x+2)^2)/(5-x) = 0
( 7*x+2 )
7*x+2 = 0 // - 2
7*x = -2 // : 7
x = -2/7
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 5}
x in { -2/7, -2/7 }
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