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