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a in (-oo:+oo)
((2/3)*(7*a-14))/(-28) = 0
(2/3*(7*a-14))/(-28) = 0
( 2/3 )
2/3 = 0
a belongs to the empty set
( 7*a-14 )
7*a-14 = 0 // + 14
7*a = 14 // : 7
a = 14/7
a = 2
a = 2
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