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D( x )
x-10 = 0
x-10 = 0
x-10 = 0
x-10 = 0 // + 10
x = 10
x in (-oo:10) U (10:+oo)
5/8 = x/(x-10) // - x/(x-10)
5/8-(x/(x-10)) = 0
(-1*x)/(x-10)+5/8 = 0
(-1*8*x)/(8*(x-10))+(5*(x-10))/(8*(x-10)) = 0
5*(x-10)-1*8*x = 0
-3*x-50 = 0
(-3*x-50)/(8*(x-10)) = 0
(-3*x-50)/(8*(x-10)) = 0 // * 8*(x-10)
-3*x-50 = 0
-3*x-50 = 0 // + 50
-3*x = 50 // : -3
x = 50/(-3)
x = -50/3
x = -50/3
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