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x in (-oo:+oo)
(2/7)*(4*x-18) = 0
2/7*(4*x-18) = 0
( 2/7 )
2/7 = 0
x belongs to the empty set
( 4*x-18 )
4*x-18 = 0 // + 18
4*x = 18 // : 4
x = 18/4
x = 9/2
x = 9/2
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