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D( x )
45-x = 0
45-x = 0
45-x = 0
45-x = 0 // - 45
-x = -45 // * -1
x = 45
x in (-oo:45) U (45:+oo)
27/(45-x) = 0.964 // - 0.964
27/(45-x)-0.964 = 0
27/(45-x)+(-0.964*(45-x))/(45-x) = 0
27-0.964*(45-x) = 0
0.964*x-16.38 = 0
(0.964*x-16.38)/(45-x) = 0
(0.964*x-16.38)/(45-x) = 0 // * 45-x
0.964*x-16.38 = 0
0.964*x-16.38 = 0 // + 16.38
0.964*x = 16.38 // : 0.964
x = 16.38/0.964
x = 16.99170124
x = 16.99170124
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