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Simplifying (x + 1) + (x + 3) = x + 13 Reorder the terms: (1 + x) + (x + 3) = x + 13 Remove parenthesis around (1 + x) 1 + x + (x + 3) = x + 13 Reorder the terms: 1 + x + (3 + x) = x + 13 Remove parenthesis around (3 + x) 1 + x + 3 + x = x + 13 Reorder the terms: 1 + 3 + x + x = x + 13 Combine like terms: 1 + 3 = 4 4 + x + x = x + 13 Combine like terms: x + x = 2x 4 + 2x = x + 13 Reorder the terms: 4 + 2x = 13 + x Solving 4 + 2x = 13 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 4 + 2x + -1x = 13 + x + -1x Combine like terms: 2x + -1x = 1x 4 + 1x = 13 + x + -1x Combine like terms: x + -1x = 0 4 + 1x = 13 + 0 4 + 1x = 13 Add '-4' to each side of the equation. 4 + -4 + 1x = 13 + -4 Combine like terms: 4 + -4 = 0 0 + 1x = 13 + -4 1x = 13 + -4 Combine like terms: 13 + -4 = 9 1x = 9 Divide each side by '1'. x = 9 Simplifying x = 9
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