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D( x )
3-(7*x) = 0
3-(7*x) = 0
3-(7*x) = 0
3-7*x = 0
3-7*x = 0 // - 3
-7*x = -3 // : -7
x = -3/(-7)
x = 3/7
x in (-oo:3/7) U (3/7:+oo)
(4*x-5)/(3-(7*x)) = 2 // - 2
(4*x-5)/(3-(7*x))-2 = 0
(4*x-5)/(3-7*x)-2 = 0
(4*x-5)/(3-7*x)+(-2*(3-7*x))/(3-7*x) = 0
4*x-2*(3-7*x)-5 = 0
18*x-11 = 0
(18*x-11)/(3-7*x) = 0
(18*x-11)/(3-7*x) = 0 // * 3-7*x
18*x-11 = 0
18*x-11 = 0 // + 11
18*x = 11 // : 18
x = 11/18
x = 11/18
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