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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^2-(7*x))/x = 0
(x^2-7*x)/x = 0
x^2-7*x = 0
x*(x-7) = 0
x-7 = 0 // + 7
x = 7
x*(x-7) = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x = 7
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