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Simplifying (2 + 4a) * 2 = 21 Reorder the terms for easier multiplication: 2(2 + 4a) = 21 (2 * 2 + 4a * 2) = 21 (4 + 8a) = 21 Solving 4 + 8a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 8a = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 8a = 21 + -4 8a = 21 + -4 Combine like terms: 21 + -4 = 17 8a = 17 Divide each side by '8'. a = 2.125 Simplifying a = 2.125
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