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D( x )
x+4 = 0
x^2+3*x-4 = 0
x-1 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x^2+3*x-4 = 0
x^2+3*x-4 = 0
x^2+3*x-4 = 0
DELTA = 3^2-(-4*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-3)/(1*2) or x = (-25^(1/2)-3)/(1*2)
x = 1 or x = -4
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:-4) U (-4:1) U (1:+oo)
(3*x)/(x^2+3*x-4)-(2/(x+4)) = 5/(x-1) // - 5/(x-1)
(3*x)/(x^2+3*x-4)-(2/(x+4))-(5/(x-1)) = 0
(3*x)/(x^2+3*x-4)-2*(x+4)^-1-5*(x-1)^-1 = 0
(3*x)/(x^2+3*x-4)-2/(x+4)-5/(x-1) = 0
x^2+3*x-4 = 0
x^2+3*x-4 = 0
x^2+3*x-4 = 0
DELTA = 3^2-(-4*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-3)/(1*2) or x = (-25^(1/2)-3)/(1*2)
x = 1 or x = -4
(x+4)*(x-1) = 0
(3*x)/((x+4)*(x-1))-2/(x+4)-5/(x-1) = 0
(3*x)/((x+4)*(x-1))+(-2*(x-1))/((x+4)*(x-1))+(-5*(x+4))/((x+4)*(x-1)) = 0
3*x-2*(x-1)-5*(x+4) = 0
x-5*x-20+2 = 0
-4*x-18 = 0
(-4*x-18)/((x+4)*(x-1)) = 0
(-4*x-18)/((x+4)*(x-1)) = 0 // * (x+4)*(x-1)
-4*x-18 = 0
-4*x-18 = 0 // + 18
-4*x = 18 // : -4
x = 18/(-4)
x = -9/2
x = -9/2
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