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Simplifying x + x + 2 + x + 4 = 21 Reorder the terms: 2 + 4 + x + x + x = 21 Combine like terms: 2 + 4 = 6 6 + x + x + x = 21 Combine like terms: x + x = 2x 6 + 2x + x = 21 Combine like terms: 2x + x = 3x 6 + 3x = 21 Solving 6 + 3x = 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 + 3x = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 3x = 21 + -6 3x = 21 + -6 Combine like terms: 21 + -6 = 15 3x = 15 Divide each side by '3'. x = 5 Simplifying x = 5
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