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x in (-oo:+oo)
(1/4)*(7*x-16) = 0
1/4*(7*x-16) = 0
( 1/4 )
1/4 = 0
x belongs to the empty set
( 7*x-16 )
7*x-16 = 0 // + 16
7*x = 16 // : 7
x = 16/7
x = 16/7
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