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x in (-oo:+oo)
(-3/4)*(8*x-28) = 0
-3/4*(8*x-28) = 0
( -3/4 )
-3/4 = 0
x belongs to the empty set
( 8*x-28 )
8*x-28 = 0 // + 28
8*x = 28 // : 8
x = 28/8
x = 7/2
x = 7/2
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