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To determine if ( x = 9 ) is a solution of the equation ( x + 6(x - 4) = 0 ), substitute ( 9 ) for ( x ):

[ 9 + 6(9 - 4) = 9 + 6(5) = 9 + 30 = 39 \neq 0. ]

Since the left side does not equal zero, ( x = 9 ) is not a solution of the equation.

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