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D( x )
5*x+1 = 0
5*x+1 = 0
5*x+1 = 0
5*x+1 = 0 // - 1
5*x = -1 // : 5
x = -1/5
x in (-oo:-1/5) U (-1/5:+oo)
(2*x-1)/(5*x+1) = 5/4 // - 5/4
(2*x-1)/(5*x+1)-(5/4) = 0
(2*x-1)/(5*x+1)-5/4 = 0
(4*(2*x-1))/(4*(5*x+1))+(-5*(5*x+1))/(4*(5*x+1)) = 0
4*(2*x-1)-5*(5*x+1) = 0
-17*x-9 = 0
(-17*x-9)/(4*(5*x+1)) = 0
(-17*x-9)/(4*(5*x+1)) = 0 // * 4*(5*x+1)
-17*x-9 = 0
-17*x-9 = 0 // + 9
-17*x = 9 // : -17
x = 9/(-17)
x = -9/17
x = -9/17
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