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D( x )
x+1 = 0
x-4 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:-1) U (-1:4) U (4:+oo)
3/(x-4) = 18/(x+1) // - 18/(x+1)
3/(x-4)-(18/(x+1)) = 0
3/(x-4)-18*(x+1)^-1 = 0
3/(x-4)-18/(x+1) = 0
(3*(x+1))/((x-4)*(x+1))+(-18*(x-4))/((x-4)*(x+1)) = 0
3*(x+1)-18*(x-4) = 0
75-15*x = 0
(75-15*x)/((x-4)*(x+1)) = 0
(75-15*x)/((x-4)*(x+1)) = 0 // * (x-4)*(x+1)
75-15*x = 0
75-15*x = 0 // - 75
-15*x = -75 // : -15
x = -75/(-15)
x = 5
x = 5
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