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D( x )
(1.43-x)/50 = 0
(1.43-x)/50 = 0
(1.43-x)/50 = 0
1.43-x = 0 // - 1.43
-x = -1.43 // * -1
x = 1.43
x in (-oo:1.43) U (1.43:+oo)
5 = (x/25)/((1.43-x)/50) // - (x/25)/((1.43-x)/50)
5-((x/25)/((1.43-x)/50)) = 0
5-2*x*(1.43-x)^-1 = 0
(-2*x)/(1.43-x)+5 = 0
(-2*x)/(1.43-x)+(5*(1.43-x))/(1.43-x) = 0
5*(1.43-x)-2*x = 0
7.15-7*x = 0
(7.15-7*x)/(1.43-x) = 0
(7.15-7*x)/(1.43-x) = 0 // * 1.43-x
7.15-7*x = 0
7.15-7*x = 0 // - 7.15
-7*x = -7.15 // : -7
x = -7.15/(-7)
x = 1.02142857
x = 1.02142857
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