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y in (-oo:+oo)
(2/7)*(14*y-28) = 0
2/7*(14*y-28) = 0
( 14*y-28 )
14*y-28 = 0 // + 28
14*y = 28 // : 14
y = 28/14
y = 2
( 2/7 )
2/7 = 0
y belongs to the empty set
y = 2
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