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D( x )
25-x = 0
25-x = 0
25-x = 0
25-x = 0 // - 25
-x = -25 // * -1
x = 25
x in (-oo:25) U (25:+oo)
333.64-(7340/(25-x)) = 0
333.64-7340*(25-x)^-1 = 0
333.64-7340/(25-x) = 0
(333.64*(25-x))/(25-x)-7340/(25-x) = 0
333.64*(25-x)-7340 = 0
1001-333.64*x = 0
(1001-333.64*x)/(25-x) = 0
(1001-333.64*x)/(25-x) = 0 // * 25-x
1001-333.64*x = 0
1001-333.64*x = 0 // - 1001
-333.64*x = -1001 // : -333.64
x = -1001/(-333.64)
x = 3.00023978
x = 3.00023978
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