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Simplifying x + (x + 13) + 2(x + 13) = 125 Reorder the terms: x + (13 + x) + 2(x + 13) = 125 Remove parenthesis around (13 + x) x + 13 + x + 2(x + 13) = 125 Reorder the terms: x + 13 + x + 2(13 + x) = 125 x + 13 + x + (13 * 2 + x * 2) = 125 x + 13 + x + (26 + 2x) = 125 Reorder the terms: 13 + 26 + x + x + 2x = 125 Combine like terms: 13 + 26 = 39 39 + x + x + 2x = 125 Combine like terms: x + x = 2x 39 + 2x + 2x = 125 Combine like terms: 2x + 2x = 4x 39 + 4x = 125 Solving 39 + 4x = 125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-39' to each side of the equation. 39 + -39 + 4x = 125 + -39 Combine like terms: 39 + -39 = 0 0 + 4x = 125 + -39 4x = 125 + -39 Combine like terms: 125 + -39 = 86 4x = 86 Divide each side by '4'. x = 21.5 Simplifying x = 21.5
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