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Simplifying 2a + 2(a + 7) + 13 = 0 Reorder the terms: 2a + 2(7 + a) + 13 = 0 2a + (7 * 2 + a * 2) + 13 = 0 2a + (14 + 2a) + 13 = 0 Reorder the terms: 14 + 13 + 2a + 2a = 0 Combine like terms: 14 + 13 = 27 27 + 2a + 2a = 0 Combine like terms: 2a + 2a = 4a 27 + 4a = 0 Solving 27 + 4a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + 4a = 0 + -27 Combine like terms: 27 + -27 = 0 0 + 4a = 0 + -27 4a = 0 + -27 Combine like terms: 0 + -27 = -27 4a = -27 Divide each side by '4'. a = -6.75 Simplifying a = -6.75
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