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