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D( x )
2-(7*x) = 0
2-(7*x) = 0
2-(7*x) = 0
2-7*x = 0
2-7*x = 0 // - 2
-7*x = -2 // : -7
x = -2/(-7)
x = 2/7
x in (-oo:2/7) U (2/7:+oo)
-4/(2-(7*x)) = 3-(5*(1/2)) // - 3-(5*(1/2))
5*(1/2)-4/(2-(7*x))-3 = 0
5*(1/2)-4/(2-7*x)-3 = 0
5/2-4/(2-7*x)-3 = 0
(-4*2)/(2*(2-7*x))+(5*(2-7*x))/(2*(2-7*x))+(-3*2*(2-7*x))/(2*(2-7*x)) = 0
5*(2-7*x)-3*2*(2-7*x)-4*2 = 0
42*x-35*x-12+2 = 0
7*x-10 = 0
(7*x-10)/(2*(2-7*x)) = 0
(7*x-10)/(2*(2-7*x)) = 0 // * 2*(2-7*x)
7*x-10 = 0
7*x-10 = 0 // + 10
7*x = 10 // : 7
x = 10/7
x = 10/7
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