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Simplifying (9a + 2)(7) = 77 Reorder the terms: (2 + 9a)(7) = 77 Reorder the terms for easier multiplication: 7(2 + 9a) = 77 (2 * 7 + 9a * 7) = 77 (14 + 63a) = 77 Solving 14 + 63a = 77 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + 63a = 77 + -14 Combine like terms: 14 + -14 = 0 0 + 63a = 77 + -14 63a = 77 + -14 Combine like terms: 77 + -14 = 63 63a = 63 Divide each side by '63'. a = 1 Simplifying a = 1
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