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Simplifying x + 2x + (3x + 1) = 13 Reorder the terms: x + 2x + (1 + 3x) = 13 Remove parenthesis around (1 + 3x) x + 2x + 1 + 3x = 13 Reorder the terms: 1 + x + 2x + 3x = 13 Combine like terms: x + 2x = 3x 1 + 3x + 3x = 13 Combine like terms: 3x + 3x = 6x 1 + 6x = 13 Solving 1 + 6x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 6x = 13 + -1 Combine like terms: 1 + -1 = 0 0 + 6x = 13 + -1 6x = 13 + -1 Combine like terms: 13 + -1 = 12 6x = 12 Divide each side by '6'. x = 2 Simplifying x = 2
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