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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x+10)/x = 1.5 // - 1.5
(x+10)/x-1.5 = 0
(x+10)/x+(-1.5*x)/x = 0
x-1.5*x+10 = 0
10-0.5*x = 0
(10-0.5*x)/x = 0
(10-0.5*x)/x = 0 // * x
10-0.5*x = 0
10-0.5*x = 0 // - 10
-0.5*x = -10 // : -0.5
x = -10/(-0.5)
x = 20
x = 20
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