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D( x )
10-x = 0
10-x = 0
10-x = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x in (-oo:10) U (10:+oo)
5 = (2*x)/(10-x) // - (2*x)/(10-x)
5-((2*x)/(10-x)) = 0
5-2*x*(10-x)^-1 = 0
(-2*x)/(10-x)+5 = 0
(-2*x)/(10-x)+(5*(10-x))/(10-x) = 0
5*(10-x)-2*x = 0
50-7*x = 0
(50-7*x)/(10-x) = 0
(50-7*x)/(10-x) = 0 // * 10-x
50-7*x = 0
50-7*x = 0 // - 50
-7*x = -50 // : -7
x = -50/(-7)
x = 50/7
x = 50/7
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