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D( x )
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x in (-oo:1/4) U (1/4:+oo)
1/7 = 3/(4*x-1) // - 3/(4*x-1)
1/7-(3/(4*x-1)) = 0
1/7-3*(4*x-1)^-1 = 0
1/7-3/(4*x-1) = 0
(-3*7)/(7*(4*x-1))+(1*(4*x-1))/(7*(4*x-1)) = 0
1*(4*x-1)-3*7 = 0
4*x-22 = 0
(4*x-22)/(7*(4*x-1)) = 0
(4*x-22)/(7*(4*x-1)) = 0 // * 7*(4*x-1)
4*x-22 = 0
4*x-22 = 0 // + 22
4*x = 22 // : 4
x = 22/4
x = 11/2
x = 11/2
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