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D( x )
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x in (-oo:-1/2) U (-1/2:+oo)
54/(2*x+1) = 6 // - 6
54/(2*x+1)-6 = 0
54/(2*x+1)+(-6*(2*x+1))/(2*x+1) = 0
54-6*(2*x+1) = 0
48-12*x = 0
(48-12*x)/(2*x+1) = 0
(48-12*x)/(2*x+1) = 0 // * 2*x+1
48-12*x = 0
48-12*x = 0 // - 48
-12*x = -48 // : -12
x = -48/(-12)
x = 4
x = 4
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