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Simplifying x + 2x + x + 3 = 21 Reorder the terms: 3 + x + 2x + x = 21 Combine like terms: x + 2x = 3x 3 + 3x + x = 21 Combine like terms: 3x + x = 4x 3 + 4x = 21 Solving 3 + 4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 4x = 21 + -3 4x = 21 + -3 Combine like terms: 21 + -3 = 18 4x = 18 Divide each side by '4'. x = 4.5 Simplifying x = 4.5
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