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D( x )
10-x = 0
x+50 = 0
10-x = 0
10-x = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x+50 = 0
x+50 = 0
x+50 = 0 // - 50
x = -50
x in (-oo:-50) U (-50:10) U (10:+oo)
1/(10-x) = 1/(x+50) // - 1/(x+50)
1/(10-x)-(1/(x+50)) = 0
1/(10-x)-(x+50)^-1 = 0
1/(10-x)-1/(x+50) = 0
(1*(x+50))/((10-x)*(x+50))+(-1*(10-x))/((10-x)*(x+50)) = 0
1*(x+50)-1*(10-x) = 0
2*x+40 = 0
(2*x+40)/((10-x)*(x+50)) = 0
(2*x+40)/((10-x)*(x+50)) = 0 // * (10-x)*(x+50)
2*x+40 = 0
2*x+40 = 0 // - 40
2*x = -40 // : 2
x = -40/2
x = -20
x = -20
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