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