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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100 = (750-x)/x // - (750-x)/x
100-((750-x)/x) = 0
(-1*(750-x))/x+100 = 0
(-1*(750-x))/x+(100*x)/x = 0
100*x-1*(750-x) = 0
101*x-750 = 0
(101*x-750)/x = 0
(101*x-750)/x = 0 // * x
101*x-750 = 0
101*x-750 = 0 // + 750
101*x = 750 // : 101
x = 750/101
x = 750/101
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