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D( x )
100-x = 0
100-x = 0
100-x = 0
100-x = 0 // - 100
-x = -100 // * -1
x = 100
x in (-oo:100) U (100:+oo)
45/(100-x) = 1.17 // - 1.17
45/(100-x)-1.17 = 0
45/(100-x)+(-1.17*(100-x))/(100-x) = 0
45-1.17*(100-x) = 0
1.17*x-72 = 0
(1.17*x-72)/(100-x) = 0
(1.17*x-72)/(100-x) = 0 // * 100-x
1.17*x-72 = 0
1.17*x-72 = 0 // + 72
1.17*x = 72 // : 1.17
x = 72/1.17
x = 61.53846154
x = 61.53846154
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