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D( x )
x+4 = 0
x+1 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-4) U (-4:-1) U (-1:+oo)
(2*x-7)/(x+1) = (2*x)/(x+4) // - (2*x)/(x+4)
(2*x-7)/(x+1)-((2*x)/(x+4)) = 0
(2*x-7)/(x+1)-2*x*(x+4)^-1 = 0
(2*x-7)/(x+1)+(-2*x)/(x+4) = 0
((2*x-7)*(x+4))/((x+1)*(x+4))+(-2*x*(x+1))/((x+1)*(x+4)) = 0
(2*x-7)*(x+4)-2*x*(x+1) = 0
-x-28 = 0
(-x-28)/((x+1)*(x+4)) = 0
(-x-28)/((x+1)*(x+4)) = 0 // * (x+1)*(x+4)
-x-28 = 0
-x-28 = 0 // + 28
-x = 28 // * -1
x = -28
x = -28
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