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Simplifying 7(a + 9) = 77 Reorder the terms: 7(9 + a) = 77 (9 * 7 + a * 7) = 77 (63 + 7a) = 77 Solving 63 + 7a = 77 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 + 7a = 77 + -63 Combine like terms: 63 + -63 = 0 0 + 7a = 77 + -63 7a = 77 + -63 Combine like terms: 77 + -63 = 14 7a = 14 Divide each side by '7'. a = 2 Simplifying a = 2
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