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D( x )
7*x = 0
7*x = 0
7*x = 0
7*x = 0 // : 7
x = 0
x in (-oo:0) U (0:+oo)
5*x*(x-2)-((28*x^3-(7*x))/(7*x))-(x-3)^2 = 0
5*x*(x-2)-((28*x^3-7*x)/(7*x))-(x-3)^2 = 0
5*x*(x-2)+(-1*(28*x^3-7*x))/(7*x)-1*(x-3)^2 = 0
(5*7*x*x*(x-2))/(7*x)+(-1*(28*x^3-7*x))/(7*x)+(-1*7*x*(x-3)^2)/(7*x) = 0
5*7*x*x*(x-2)-1*(28*x^3-7*x)-1*7*x*(x-3)^2 = 0
7*x^3-7*x^3-70*x^2+42*x^2+7*x-63*x = 0
-28*x^2-56*x = 0
-28*x^2-56*x = 0
-28*x*(x+2) = 0
x+2 = 0 // - 2
x = -2
-28*x*(x+2) = 0
(-28*x*(x+2))/(7*x) = 0
(-28*x*(x+2))/(7*x) = 0 // * 7*x
-28*x*(x+2) = 0
( -28*x )
-28*x = 0 // : -28
x = 0
( x+2 )
x+2 = 0 // - 2
x = -2
x in { 0}
x = -2
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