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Simplifying 21 = 2(x + 2) + x + 2 Reorder the terms: 21 = 2(2 + x) + x + 2 21 = (2 * 2 + x * 2) + x + 2 21 = (4 + 2x) + x + 2 Reorder the terms: 21 = 4 + 2 + 2x + x Combine like terms: 4 + 2 = 6 21 = 6 + 2x + x Combine like terms: 2x + x = 3x 21 = 6 + 3x Solving 21 = 6 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 21 + -3x = 6 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + -3x = 6 + 0 21 + -3x = 6 Add '-21' to each side of the equation. 21 + -21 + -3x = 6 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 6 + -21 -3x = 6 + -21 Combine like terms: 6 + -21 = -15 -3x = -15 Divide each side by '-3'. x = 5 Simplifying x = 5
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