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x in (-oo:+oo)
4*(5*x-(6/4)) = 0
4*(5*x-3/2) = 0
( 4 )
4 = 0
x belongs to the empty set
( 5*x-3/2 )
5*x-3/2 = 0 // + 3/2
5*x = 3/2 // : 5
x = 3/2/5
x = 3/10
x = 3/10
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