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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-((x-3500)/x) = 22 // - 22
1-((x-3500)/x)-22 = 0
(-1*(x-3500))/x-22+1 = 0
(-1*(x-3500))/x+(-22*x)/x+(1*x)/x = 0
1*x-1*(x-3500)-22*x = 0
x-23*x+3500 = 0
3500-22*x = 0
(3500-22*x)/x = 0
(3500-22*x)/x = 0 // * x
3500-22*x = 0
3500-22*x = 0 // - 3500
-22*x = -3500 // : -22
x = -3500/(-22)
x = 1750/11
x = 1750/11
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