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D( x )
x+x-8 = 0
x+x-8 = 0
x+x-8 = 0
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
x in (-oo:4) U (4:+oo)
2/(x+x-8) = 25 // - 25
2/(x+x-8)-25 = 0
2/(2*x-8)-25 = 0
2/(2*x-8)+(-25*(2*x-8))/(2*x-8) = 0
2-25*(2*x-8) = 0
202-50*x = 0
(202-50*x)/(2*x-8) = 0
(202-50*x)/(2*x-8) = 0 // * 2*x-8
202-50*x = 0
202-50*x = 0 // - 202
-50*x = -202 // : -50
x = -202/(-50)
x = 101/25
x = 101/25
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