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X in (-oo:+oo)
-6*(7/5-((1/5)*X)) = 0
-6*((-1/5)*X+7/5) = 0
-6*(7/5-1/5*X) = 0
( -6 )
-6 = 0
X belongs to the empty set
( 7/5-1/5*X )
7/5-1/5*X = 0 // - 7/5
-1/5*X = -7/5 // : -1/5
X = -7/5/(-1/5)
X = 7
X = 7
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