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Simplifying 21 = 2x + 3(2 + x) 21 = 2x + (2 * 3 + x * 3) 21 = 2x + (6 + 3x) Reorder the terms: 21 = 6 + 2x + 3x Combine like terms: 2x + 3x = 5x 21 = 6 + 5x Solving 21 = 6 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 21 + -5x = 6 + 5x + -5x Combine like terms: 5x + -5x = 0 21 + -5x = 6 + 0 21 + -5x = 6 Add '-21' to each side of the equation. 21 + -21 + -5x = 6 + -21 Combine like terms: 21 + -21 = 0 0 + -5x = 6 + -21 -5x = 6 + -21 Combine like terms: 6 + -21 = -15 -5x = -15 Divide each side by '-5'. x = 3 Simplifying x = 3
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