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D( x )
1-(4*x) = 0
x+8 = 0
1-(4*x) = 0
1-(4*x) = 0
1-4*x = 0
1-4*x = 0 // - 1
-4*x = -1 // : -4
x = -1/(-4)
x = 1/4
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:1/4) U (1/4:+oo)
(7*x-6)/(1-(4*x)) = (x-4)/(x+8) // - (x-4)/(x+8)
(7*x-6)/(1-(4*x))-((x-4)/(x+8)) = 0
(7*x-6)/(1-4*x)-((x-4)/(x+8)) = 0
(7*x-6)/(1-4*x)+(-1*(x-4))/(x+8) = 0
((7*x-6)*(x+8))/((1-4*x)*(x+8))+(-1*(x-4)*(1-4*x))/((1-4*x)*(x+8)) = 0
(7*x-6)*(x+8)-1*(x-4)*(1-4*x) = 0
11*x^2+33*x-44 = 0
11*x^2+33*x-44 = 0
11*(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
11*(x+4)*(x-1) = 0
(11*(x+4)*(x-1))/((1-4*x)*(x+8)) = 0
(11*(x+4)*(x-1))/((1-4*x)*(x+8)) = 0 // * (1-4*x)*(x+8)
11*(x+4)*(x-1) = 0
( x+4 )
x+4 = 0 // - 4
x = -4
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -4, 1 }
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