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Simplifying x + 2x + 4 = 13 Reorder the terms: 4 + x + 2x = 13 Combine like terms: x + 2x = 3x 4 + 3x = 13 Solving 4 + 3x = 13 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 + 3x = 13 + -4 Combine like terms: 4 + -4 = 0 0 + 3x = 13 + -4 3x = 13 + -4 Combine like terms: 13 + -4 = 9 3x = 9 Divide each side by '3'. x = 3 Simplifying x = 3
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