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x in (-oo:+oo)
(3/20)*(6*x-(2*x^2)) = 0
(3/20)*(6*x-2*x^2) = 0
3/20*(6*x-2*x^2) = 0
6*x-2*x^2 = 0
2*x*(3-x) = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
2*x*(x-3) = 0
3/20*2*x*(x-3) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( 3/20 )
3/20 = 0
x belongs to the empty set
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 0, 3 }
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