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Simplifying 2(3x + 3) = 21 Reorder the terms: 2(3 + 3x) = 21 (3 * 2 + 3x * 2) = 21 (6 + 6x) = 21 Solving 6 + 6x = 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 + 6x = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 6x = 21 + -6 6x = 21 + -6 Combine like terms: 21 + -6 = 15 6x = 15 Divide each side by '6'. x = 2.5 Simplifying x = 2.5
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