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Simplifying 2(a + 13) + -7 = 7 Reorder the terms: 2(13 + a) + -7 = 7 (13 * 2 + a * 2) + -7 = 7 (26 + 2a) + -7 = 7 Reorder the terms: 26 + -7 + 2a = 7 Combine like terms: 26 + -7 = 19 19 + 2a = 7 Solving 19 + 2a = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-19' to each side of the equation. 19 + -19 + 2a = 7 + -19 Combine like terms: 19 + -19 = 0 0 + 2a = 7 + -19 2a = 7 + -19 Combine like terms: 7 + -19 = -12 2a = -12 Divide each side by '2'. a = -6 Simplifying a = -6
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