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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)
(2*x+13)/(4*x+1) = 3/4 // - 3/4
(2*x+13)/(4*x+1)-(3/4) = 0
(2*x+13)/(4*x+1)-3/4 = 0
(4*(2*x+13))/(4*(4*x+1))+(-3*(4*x+1))/(4*(4*x+1)) = 0
4*(2*x+13)-3*(4*x+1) = 0
49-4*x = 0
(49-4*x)/(4*(4*x+1)) = 0
(49-4*x)/(4*(4*x+1)) = 0 // * 4*(4*x+1)
49-4*x = 0
49-4*x = 0 // - 49
-4*x = -49 // : -4
x = -49/(-4)
x = 49/4
x = 49/4
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