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x*((13*x-3)/5) = 0
(x*(13*x-3))/5 = 0
( 13*x-3 )
13*x-3 = 0 // + 3
13*x = 3 // : 13
x = 3/13
( x )
x = 0
x in { 3/13, 0 }
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