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Simplifying 2(a + 7) + 7 = 9 Reorder the terms: 2(7 + a) + 7 = 9 (7 * 2 + a * 2) + 7 = 9 (14 + 2a) + 7 = 9 Reorder the terms: 14 + 7 + 2a = 9 Combine like terms: 14 + 7 = 21 21 + 2a = 9 Solving 21 + 2a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 2a = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 2a = 9 + -21 2a = 9 + -21 Combine like terms: 9 + -21 = -12 2a = -12 Divide each side by '2'. a = -6 Simplifying a = -6
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