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x in (-oo:+oo)
30*(4*x-(3/3)) = 0
30*(4*x-1) = 0
( 30 )
30 = 0
x belongs to the empty set
( 4*x-1 )
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x = 1/4
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