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(((2/3)*(3*x-6)^1)/4)*(20*x-4) = 0
(((2/3)*(3*x-6))/4)*(20*x-4) = 0
(2/3*(3*x-6)*(20*x-4))/4 = 0
( 20*x-4 )
20*x-4 = 0 // + 4
20*x = 4 // : 20
x = 4/20
x = 1/5
( 3*x-6 )
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x in { 1/5, 2 }
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