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D( x )
7*x-1 = 0
7*x-1 = 0
7*x-1 = 0
7*x-1 = 0 // + 1
7*x = 1 // : 7
x = 1/7
x in (-oo:1/7) U (1/7:+oo)
(7*x^2-(22*x))/(7*x-1) = 0
(7*x^2-22*x)/(7*x-1) = 0
7*x^2-22*x = 0
x*(7*x-22) = 0
7*x-22 = 0 // + 22
7*x = 22 // : 7
x = 22/7
x*(x-22/7) = 0
(x*(x-22/7))/(7*x-1) = 0
( x-22/7 )
x-22/7 = 0 // + 22/7
x = 22/7
( x )
x = 0
x in { 22/7, 0 }
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