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Simplifying 9a + 9(57 + 9a) = -27 9a + (57 * 9 + 9a * 9) = -27 9a + (513 + 81a) = -27 Reorder the terms: 513 + 9a + 81a = -27 Combine like terms: 9a + 81a = 90a 513 + 90a = -27 Solving 513 + 90a = -27 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-513' to each side of the equation. 513 + -513 + 90a = -27 + -513 Combine like terms: 513 + -513 = 0 0 + 90a = -27 + -513 90a = -27 + -513 Combine like terms: -27 + -513 = -540 90a = -540 Divide each side by '90'. a = -6 Simplifying a = -6
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