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Simplifying 3(2x + 1) = 21 Reorder the terms: 3(1 + 2x) = 21 (1 * 3 + 2x * 3) = 21 (3 + 6x) = 21 Solving 3 + 6x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 6x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 6x = 21 + -3 6x = 21 + -3 Combine like terms: 21 + -3 = 18 6x = 18 Divide each side by '6'. x = 3 Simplifying x = 3
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