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D( x )
14-x = 0
14-x = 0
14-x = 0
14-x = 0 // - 14
-x = -14 // * -1
x = 14
x in (-oo:14) U (14:+oo)
24 = (2.5-1.5)/(14-x) // - (2.5-1.5)/(14-x)
24-((2.5-1.5)/(14-x)) = 0
(-1*1)/(14-x)+24 = 0
(-1*1)/(14-x)+(24*(14-x))/(14-x) = 0
24*(14-x)-1*1 = 0
335-24*x = 0
(335-24*x)/(14-x) = 0
(335-24*x)/(14-x) = 0 // * 14-x
335-24*x = 0
335-24*x = 0 // - 335
-24*x = -335 // : -24
x = -335/(-24)
x = 335/24
x = 335/24
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