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x in (-oo:+oo)
3*(x/5-(2/5)) = 0
3*(x/5-2/5) = 0
3*(1/5*x-2/5) = 0
( 1/5*x-2/5 )
1/5*x-2/5 = 0 // + 2/5
1/5*x = 2/5 // : 1/5
x = 2/5/1/5
x = 2
( 3 )
3 = 0
x belongs to the empty set
x = 2
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