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Simplifying (x + 2) + (x + -1) + x = 13 Reorder the terms: (2 + x) + (x + -1) + x = 13 Remove parenthesis around (2 + x) 2 + x + (x + -1) + x = 13 Reorder the terms: 2 + x + (-1 + x) + x = 13 Remove parenthesis around (-1 + x) 2 + x + -1 + x + x = 13 Reorder the terms: 2 + -1 + x + x + x = 13 Combine like terms: 2 + -1 = 1 1 + x + x + x = 13 Combine like terms: x + x = 2x 1 + 2x + x = 13 Combine like terms: 2x + x = 3x 1 + 3x = 13 Solving 1 + 3x = 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 + 3x = 13 + -1 Combine like terms: 1 + -1 = 0 0 + 3x = 13 + -1 3x = 13 + -1 Combine like terms: 13 + -1 = 12 3x = 12 Divide each side by '3'. x = 4 Simplifying x = 4
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