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Simplifying 2(x + 5) + 8 = 21 Reorder the terms: 2(5 + x) + 8 = 21 (5 * 2 + x * 2) + 8 = 21 (10 + 2x) + 8 = 21 Reorder the terms: 10 + 8 + 2x = 21 Combine like terms: 10 + 8 = 18 18 + 2x = 21 Solving 18 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 2x = 21 + -18 Combine like terms: 18 + -18 = 0 0 + 2x = 21 + -18 2x = 21 + -18 Combine like terms: 21 + -18 = 3 2x = 3 Divide each side by '2'. x = 1.5 Simplifying x = 1.5
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