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D( x )
x-5 = 0
x = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x = 0
x = 0
x in (-oo:0) U (0:5) U (5:+oo)
(4*x)/x-5 = 20/(x-5)+7 // - 20/(x-5)+7
(4*x)/x-(20/(x-5))-7-5 = 0
(4*x)/x-20*(x-5)^-1-7-5 = 0
4-20/(x-5)-7-5 = 0
(4*(x-5))/(x-5)-20/(x-5)+(-7*(x-5))/(x-5)+(-5*(x-5))/(x-5) = 0
4*(x-5)-7*(x-5)-5*(x-5)-20 = 0
4*x-7*x-5*x-40+25+35 = 0
25-3*x-5*x-5 = 0
20-8*x = 0
(20-8*x)/(x-5) = 0
(20-8*x)/(x-5) = 0 // * x-5
20-8*x = 0
20-8*x = 0 // - 20
-8*x = -20 // : -8
x = -20/(-8)
x = 5/2
x = 5/2
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