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Simplifying (X + 3) * 2 = 21 Reorder the terms: (3 + X) * 2 = 21 Reorder the terms for easier multiplication: 2(3 + X) = 21 (3 * 2 + X * 2) = 21 (6 + 2X) = 21 Solving 6 + 2X = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 2X = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 2X = 21 + -6 2X = 21 + -6 Combine like terms: 21 + -6 = 15 2X = 15 Divide each side by '2'. X = 7.5 Simplifying X = 7.5
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