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Simplifying 9(2a + 7) = 81 Reorder the terms: 9(7 + 2a) = 81 (7 * 9 + 2a * 9) = 81 (63 + 18a) = 81 Solving 63 + 18a = 81 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 18a = 81 + -63 Combine like terms: 63 + -63 = 0 0 + 18a = 81 + -63 18a = 81 + -63 Combine like terms: 81 + -63 = 18 18a = 18 Divide each side by '18'. a = 1 Simplifying a = 1
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