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D( x )
5*x-7 = 0
5*x-7 = 0
5*x-7 = 0
5*x-7 = 0 // + 7
5*x = 7 // : 5
x = 7/5
x in (-oo:7/5) U (7/5:+oo)
3/8 = (2*x-4)/(5*x-7) // - (2*x-4)/(5*x-7)
3/8-((2*x-4)/(5*x-7)) = 0
(-1*(2*x-4))/(5*x-7)+3/8 = 0
(-1*8*(2*x-4))/(8*(5*x-7))+(3*(5*x-7))/(8*(5*x-7)) = 0
3*(5*x-7)-1*8*(2*x-4) = 0
11-x = 0
(11-x)/(8*(5*x-7)) = 0
(11-x)/(8*(5*x-7)) = 0 // * 8*(5*x-7)
11-x = 0
11-x = 0 // - 11
-x = -11 // * -1
x = 11
x = 11
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