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D( x )
-3*x-28 = 0
-3*x-28 = 0
-3*x-28 = 0
-3*x-28 = 0 // + 28
-3*x = 28 // : -3
x = 28/(-3)
x = -28/3
x in (-oo:-28/3) U (-28/3:+oo)
4*x-(28/(-3*x-28)) = 0
4*x-28*(-3*x-28)^-1 = 0
4*x-28/(-3*x-28) = 0
(4*x*(-3*x-28))/(-3*x-28)-28/(-3*x-28) = 0
4*x*(-3*x-28)-28 = 0
-12*x^2-112*x-28 = 0
-12*x^2-112*x-28 = 0
-4*(3*x^2+28*x+7) = 0
3*x^2+28*x+7 = 0
DELTA = 28^2-(3*4*7)
DELTA = 700
DELTA > 0
x = (700^(1/2)-28)/(2*3) or x = (-700^(1/2)-28)/(2*3)
x = (10*7^(1/2)-28)/6 or x = (-10*7^(1/2)-28)/6
-4*(x-((-10*7^(1/2)-28)/6))*(x-((10*7^(1/2)-28)/6)) = 0
(-4*(x-((-10*7^(1/2)-28)/6))*(x-((10*7^(1/2)-28)/6)))/(-3*x-28) = 0
(-4*(x-((-10*7^(1/2)-28)/6))*(x-((10*7^(1/2)-28)/6)))/(-3*x-28) = 0 // * -3*x-28
-4*(x-((-10*7^(1/2)-28)/6))*(x-((10*7^(1/2)-28)/6)) = 0
( -4 )
-4 = 0
x belongs to the empty set
( x-((-10*7^(1/2)-28)/6) )
x-((-10*7^(1/2)-28)/6) = 0 // + (-10*7^(1/2)-28)/6
x = (-10*7^(1/2)-28)/6
( x-((10*7^(1/2)-28)/6) )
x-((10*7^(1/2)-28)/6) = 0 // + (10*7^(1/2)-28)/6
x = (10*7^(1/2)-28)/6
x in { (-10*7^(1/2)-28)/6, (10*7^(1/2)-28)/6 }
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