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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6-(2*t) = c/x // - c/x
6-(c/x)-(2*t) = 0
6-(c/x)-2*t = 0
-c*x^-1 = -(6-2*t) // : -c
x^-1 = (6-2*t)/c
-1 < 0
1/(x^1) = (6-2*t)/c // * x^1
1 = x^1*((6-2*t)/c) // : (6-2*t)/c
1/((6-2*t)/c) = x^1
x = 1/((6-2*t)/c)
x = 1/((6-2*t)/c)
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