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Simplifying 2(a + -1) + 5 = 21 Reorder the terms: 2(-1 + a) + 5 = 21 (-1 * 2 + a * 2) + 5 = 21 (-2 + 2a) + 5 = 21 Reorder the terms: -2 + 5 + 2a = 21 Combine like terms: -2 + 5 = 3 3 + 2a = 21 Solving 3 + 2a = 21 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 = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 2a = 21 + -3 2a = 21 + -3 Combine like terms: 21 + -3 = 18 2a = 18 Divide each side by '2'. a = 9 Simplifying a = 9
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