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Simplifying x + (x + 7) = 13 Reorder the terms: x + (7 + x) = 13 Remove parenthesis around (7 + x) x + 7 + x = 13 Reorder the terms: 7 + x + x = 13 Combine like terms: x + x = 2x 7 + 2x = 13 Solving 7 + 2x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2x = 13 + -7 Combine like terms: 7 + -7 = 0 0 + 2x = 13 + -7 2x = 13 + -7 Combine like terms: 13 + -7 = 6 2x = 6 Divide each side by '2'. x = 3 Simplifying x = 3
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