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x^4*((49-x^2)/3)*((7*x)/35-(5*x)) = 0
x^4*((49-x^2)/3)*((7*x)/35-5*x) = 0
(-24/5*x*x^4*(49-x^2))/3 = 0
( -24/5*x )
-24/5*x = 0 // : -24/5
x = 0
( 49-x^2 )
-1*x^2 = -49 // : -1
x^2 = 49
x^2 = 49 // ^ 1/2
abs(x) = 7
x = 7 or x = -7
( x^4 )
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in { 0, 7, -7, 0 }
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