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D( x )
2*x-10 = 0
2*x-10 = 0
2*x-10 = 0
2*x-10 = 0 // + 10
2*x = 10 // : 2
x = 10/2
x = 5
x in (-oo:5) U (5:+oo)
(4*x+30)/(2*x-10) = 60 // - 60
(4*x+30)/(2*x-10)-60 = 0
(4*x+30)/(2*x-10)+(-60*(2*x-10))/(2*x-10) = 0
4*x-60*(2*x-10)+30 = 0
630-116*x = 0
(630-116*x)/(2*x-10) = 0
(630-116*x)/(2*x-10) = 0 // * 2*x-10
630-116*x = 0
630-116*x = 0 // - 630
-116*x = -630 // : -116
x = -630/(-116)
x = 315/58
x = 315/58
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