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D( x )
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x in (-oo:1/4) U (1/4:+oo)
25/(4*x-1) = 7.2 // - 7.2
25/(4*x-1)-7.2 = 0
25/(4*x-1)+(-7.2*(4*x-1))/(4*x-1) = 0
25-7.2*(4*x-1) = 0
32.2-28.8*x = 0
(32.2-28.8*x)/(4*x-1) = 0
(32.2-28.8*x)/(4*x-1) = 0 // * 4*x-1
32.2-28.8*x = 0
32.2-28.8*x = 0 // - 32.2
-28.8*x = -32.2 // : -28.8
x = -32.2/(-28.8)
x = 1.11805556
x = 1.11805556
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