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(4*x-5)*(3-x)*((1/2)*x-2) = 0
(4*x-5)*(3-x)*(1/2*x-2) = 0
( 1/2*x-2 )
1/2*x-2 = 0 // + 2
1/2*x = 2 // : 1/2
x = 2/1/2
x = 4
( 3-x )
3-x = 0 // - 3
-x = -3 // * -1
x = 3
( 4*x-5 )
4*x-5 = 0 // + 5
4*x = 5 // : 4
x = 5/4
x in { 4, 3, 5/4 }
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