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D( x )
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
2/(2*x-5) = -2 // + 2
2/(2*x-5)+2 = 0
2/(2*x-5)+(2*(2*x-5))/(2*x-5) = 0
2*(2*x-5)+2 = 0
4*x-10+2 = 0
(4*x-10+2)/(2*x-5) = 0
(4*x-10+2)/(2*x-5) = 0 // * 2*x-5
4*x-10+2 = 0
4*x-10+2 = 0 // - 2-10
4*x = -(2-10) // : 4
x = (-(2-10))/4
x = (10-2)/4
x = (10-2)/4
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