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Simplifying 9(9a) = 0 Remove parenthesis around (9a) 9 * 9a = 0 Multiply 9 * 9 81a = 0 Solving 81a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '81'. a = 0 Simplifying a = 0
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