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a in (-oo:+oo)
(-4/7)*(14*a-42) = 0
-4/7*(14*a-42) = 0
( -4/7 )
-4/7 = 0
a belongs to the empty set
( 14*a-42 )
14*a-42 = 0 // + 42
14*a = 42 // : 14
a = 42/14
a = 3
a = 3
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