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Simplifying 3(3 + 3a) + 6 = 81 (3 * 3 + 3a * 3) + 6 = 81 (9 + 9a) + 6 = 81 Reorder the terms: 9 + 6 + 9a = 81 Combine like terms: 9 + 6 = 15 15 + 9a = 81 Solving 15 + 9a = 81 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 9a = 81 + -15 Combine like terms: 15 + -15 = 0 0 + 9a = 81 + -15 9a = 81 + -15 Combine like terms: 81 + -15 = 66 9a = 66 Divide each side by '9'. a = 7.333333333 Simplifying a = 7.333333333
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