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Simplifying 3(3a + 3) + 6 = 78 Reorder the terms: 3(3 + 3a) + 6 = 78 (3 * 3 + 3a * 3) + 6 = 78 (9 + 9a) + 6 = 78 Reorder the terms: 9 + 6 + 9a = 78 Combine like terms: 9 + 6 = 15 15 + 9a = 78 Solving 15 + 9a = 78 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 = 78 + -15 Combine like terms: 15 + -15 = 0 0 + 9a = 78 + -15 9a = 78 + -15 Combine like terms: 78 + -15 = 63 9a = 63 Divide each side by '9'. a = 7 Simplifying a = 7
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