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Simplifying 2(x + 2) + 3x = 21 Reorder the terms: 2(2 + x) + 3x = 21 (2 * 2 + x * 2) + 3x = 21 (4 + 2x) + 3x = 21 Combine like terms: 2x + 3x = 5x 4 + 5x = 21 Solving 4 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 5x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 5x = 21 + -4 5x = 21 + -4 Combine like terms: 21 + -4 = 17 5x = 17 Divide each side by '5'. x = 3.4 Simplifying x = 3.4
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