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Simplifying 2x + 3(x + 3) = 21 Reorder the terms: 2x + 3(3 + x) = 21 2x + (3 * 3 + x * 3) = 21 2x + (9 + 3x) = 21 Reorder the terms: 9 + 2x + 3x = 21 Combine like terms: 2x + 3x = 5x 9 + 5x = 21 Solving 9 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 5x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 5x = 21 + -9 5x = 21 + -9 Combine like terms: 21 + -9 = 12 5x = 12 Divide each side by '5'. x = 2.4 Simplifying x = 2.4
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