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D( x )
-5*x-5 = 0
-5*x-5 = 0
-5*x-5 = 0
-5*x-5 = 0 // + 5
-5*x = 5 // : -5
x = 5/(-5)
x = -1
x in (-oo:-1) U (-1:+oo)
2/(-5*x-5)-10 = 0
2/(-5*x-5)+(-10*(-5*x-5))/(-5*x-5) = 0
2-10*(-5*x-5) = 0
50*x+52 = 0
(50*x+52)/(-5*x-5) = 0
(50*x+52)/(-5*x-5) = 0 // * -5*x-5
50*x+52 = 0
50*x+52 = 0 // - 52
50*x = -52 // : 50
x = -52/50
x = -26/25
x = -26/25
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