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(X^2-((4/5)*x))*((30/3)*x-6) = 0
(X^2+(-4/5)*x)*((30/3)*x-6) = 0
(X^2-4/5*x)*(10*x-6) = 0
( 10*x-6 )
10*x-6 = 0 // + 6
10*x = 6 // : 10
x = 6/10
x = 3/5
( X^2-4/5*x )
X^2-4/5*x = 0 // - X^2
-4/5*x = -X^2 // : -4/5
x = (-X^2)/(-4/5)
x = 5/4*X^2
x in { 3/5, 5/4*X^2 }
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