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Simplifying 2(a + -1) + 5 = 13 Reorder the terms: 2(-1 + a) + 5 = 13 (-1 * 2 + a * 2) + 5 = 13 (-2 + 2a) + 5 = 13 Reorder the terms: -2 + 5 + 2a = 13 Combine like terms: -2 + 5 = 3 3 + 2a = 13 Solving 3 + 2a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2a = 13 + -3 Combine like terms: 3 + -3 = 0 0 + 2a = 13 + -3 2a = 13 + -3 Combine like terms: 13 + -3 = 10 2a = 10 Divide each side by '2'. a = 5 Simplifying a = 5
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