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