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Simplifying 9(a + 9) = 126 Reorder the terms: 9(9 + a) = 126 (9 * 9 + a * 9) = 126 (81 + 9a) = 126 Solving 81 + 9a = 126 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + -81 + 9a = 126 + -81 Combine like terms: 81 + -81 = 0 0 + 9a = 126 + -81 9a = 126 + -81 Combine like terms: 126 + -81 = 45 9a = 45 Divide each side by '9'. a = 5 Simplifying a = 5
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