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D( x )
7*x-(7/2) = 0
7*x-(7/2) = 0
7*x-(7/2) = 0
7*x-7/2 = 0
7*x-7/2 = 0 // + 7/2
7*x = 7/2 // : 7
x = 7/2/7
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(3*x-(3/7))/(7*x-(7/2)) = 0
(3*x-3/7)/(7*x-7/2) = 0
3*x-3/7 = 0 // + 3/7
3*x = 3/7 // : 3
x = 3/7/3
x = 1/7
x = 1/7
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